sanitizer_common: fix SIG_DFL warning
Currently we have: sanitizer_posix_libcdep.cpp:146:27: warning: cast between incompatible function types from ‘__sighandler_t’ {aka ‘void (*)(int)’} to ‘sa_sigaction_t’ 146 | sigact.sa_sigaction = (sa_sigaction_t)SIG_DFL; We don't set SA_SIGINFO, so we need to assign to sa_handler. And SIG_DFL is meant for sa_handler, so this gets rid of both compiler warning, type cast and potential runtime misbehavior. Reviewed By: vitalybuka Differential Revision: https://reviews.llvm.org/D102162
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