Fixup signed/unsigned comparison warnings on OSX in getentropy_osx.c
Fixup signed/unsigned comparison warnings on OSX in getentropy_osx.c

LTD-Beget/unbound,binsys/unbound,LTD-Beget/unbound,binsys/unbound,binsys/unbound,LTD-Beget/unbound,binsys/unbound,LTD-Beget/unbound