- Use MAP_FAILED error code for check whether mmap() was successful

- Replace various malloc() with Z_Malloc
- Fix several memory leaks when VM compilation failed and Com_Error is called
- Make failed mmap/VirtualAlloc/malloc calls fatal

code/qcommon/vm_sparc.c

@@ -1427,7 +1427,7 @@ static void sparc_compute_code(vm_t *vm, struct func_info * const fp)
 
 	data_and_code = mmap(NULL, code_length, PROT_READ | PROT_WRITE,
 			     MAP_SHARED | MAP_ANONYMOUS, -1, 0);
-	if (!data_and_code)
+	if (data_and_code == MAP_FAILED)
 		DIE("Not enough memory");
 
 	code_now = code_begin = (unsigned int *)