liboffloadmic: Add missed checks for malloc and strdup return values

liboffloadmic: Add missed checks for malloc and strdup return values

liboffloadmic/
	* runtime/offload_engine.cpp (Engine::init_process): Use strdup instead
	of sizeof+malloc+sprintf, check for return value.
	* runtime/offload_env.cpp (MicEnvVar::get_env_var_kind): Check for
	strdup return value.
	* runtime/offload_host.cpp (__offload_init_library_once): Check for
	strdup return value.  Fix size calculation of COI_HOST_THREAD_AFFINITY.
	* runtime/emulator/coi_device.cpp (COIProcessWaitForShutdown): Check for
	malloc return value.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@228622 138bc75d-0d04-0410-961f-82ee72b054a4