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uae_sem_init(): Bad allocation size fix (sem->sem = (sem_t*…

Libretro-Admin requested to merge github/fork/repojohnray/master into master

Created by: repojohnray

…)calloc(0, sizeof(sem_t)); -> sem->sem = (sem_t*)calloc(1, sizeof(sem_t));)

This issue generates the following valgrind event on my linux x86_64 system (and it crashes my arm thumb a7 linux setup too...): ==8668== Invalid write of size 8 ==8668== at 0x5E92AD9: sem_init@@GLIBC_2.2.5 (in /lib64/ ==8668== by 0xBC9FF63: uae_sem_init (libretro-uae-20160530-r0-84287ade/sources/src/threaddep/thread.c:197) ... ==8668== Address 0x14aca730 is 0 bytes after a block of size 0 alloc'd

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