libsepol: make reallocarray check more robust #439
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Some cross-compiler toolchains dislike the usage of -o /dev/null and fail with: ld: final link failed: file truncated
As stdin and stdout is already redirected to /dev/null there is no need for gcc -o /dev/null.
This fixes an Buildroot autobuild failure for libsepol package: http://autobuild.buildroot.net/results/72b/72baaab4658254f4c5b3348298af1d5c891cacd6/