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Fix C warnings #4

Description

@jakobbossek

I have no idea how to solve incompatible pointer types passing warnings.

── R CMD check ─────────────────────────────────────────────────────────────────
─ using log directory ‘/private/var/folders/lr/g4jxbpys6z54qrs4ppyln72c0000gn/T/rcheck-sampling-20191218-222222/sampling.Rcheck’ (339ms)
─ using R version 3.5.2 (2018-12-20)
─ using platform: x86_64-apple-darwin15.6.0 (64-bit)
─ using session charset: UTF-8
✔ checking for file ‘sampling/DESCRIPTION’ ...
─ this is package ‘sampling’ version ‘1.0.0.0000’
─ package encoding: UTF-8
✔ checking package namespace information
✔ checking package dependencies (6.1s)
✔ checking if this is a source package
✔ checking if there is a namespace
✔ checking for executable files ...
✔ checking for hidden files and directories
✔ checking for portable file names
✔ checking for sufficient/correct file permissions
W checking whether package ‘sampling’ can be installed (3.7s)
Found the following significant warnings:
bz_discr.c:85:48: warning: incompatible pointer types passing 'int (double **, double *)' to parameter of type 'int ( _Nonnull)(const void *, const void *)' [-Wincompatible-pointer-types]
dem_discr.c:101:59: warning: incompatible pointer types passing 'int (double *, double )' to parameter of type 'int ( _Nonnull)(const void *, const void *)' [-Wincompatible-pointer-types]
dem_discr.c:229:48: warning: incompatible pointer types passing 'int (double **, double *)' to parameter of type 'int ( _Nonnull)(const void *, const void *)' [-Wincompatible-pointer-types]
dem_discr.c:230:44: warning: incompatible pointer types passing 'int (double **, double *)' to parameter of type 'int ( _Nonnull)(const void *, const void *)' [-Wincompatible-pointer-types]
dem_discr.c:292:52: warning: incompatible pointer types passing 'int (double **, double *)' to parameter of type 'int ( _Nonnull)(const void *, const void *)' [-Wincompatible-pointer-types]
See ‘/private/var/folders/lr/g4jxbpys6z54qrs4ppyln72c0000gn/T/rcheck-sampling-20191218-222222/sampling.Rcheck/00install.out’ for details.
✔ checking installed package size ...
✔ checking package directory
✔ checking DESCRIPTION meta-information (369ms)
✔ checking top-level files
✔ checking for left-over files
✔ checking index information
✔ checking package subdirectories ...
✔ checking R files for non-ASCII characters ...
✔ checking R files for syntax errors ...
✔ checking whether the package can be loaded ...
✔ checking whether the package can be loaded with stated dependencies ...
✔ checking whether the package can be unloaded cleanly ...
✔ checking whether the namespace can be loaded with stated dependencies ...
✔ checking whether the namespace can be unloaded cleanly ...
✔ checking loading without being on the library search path ...
✔ checking dependencies in R code (350ms)
✔ checking S3 generic/method consistency (533ms)
✔ checking replacement functions ...
✔ checking foreign function calls ...
✔ checking R code for possible problems (1.3s)
✔ checking Rd files ...
✔ checking Rd metadata ...
✔ checking Rd cross-references ...
✔ checking for missing documentation entries ...
✔ checking for code/documentation mismatches (752ms)
✔ checking Rd \usage sections (788ms)
✔ checking Rd contents ...
✔ checking for unstated dependencies in examples ...
✔ checking line endings in C/C++/Fortran sources/headers
W checking compiled code ...
File ‘sampling/libs/sampling.so’:
Found ‘___stderrp’, possibly from ‘stderr’ (C)
Objects: ‘TA_common.o’, ‘TA_shrink_bardelta.o’,
‘TA_shrink_delta.o’, ‘bz_discr.o’, ‘dem_discr.o’,
‘simple_discr.o’
Found ‘___stdoutp’, possibly from ‘stdout’ (C)
Objects: ‘TA_shrink_bardelta.o’, ‘TA_shrink_delta.o’
Found ‘_abort’, possibly from ‘abort’ (C)
Objects: ‘TA_common.o’, ‘dem_discr.o’
Found ‘_rand’, possibly from ‘rand’ (C)
Object: ‘TA_common.o’
Found ‘_random’, possibly from ‘random’ (C)
Objects: ‘TA_common.o’, ‘simple_discr.o’

Compiled code should not call entry points which might terminate R nor
write to stdout/stderr instead of to the console, nor use Fortran I/O
nor system RNGs.

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