Merge pull request #705 from Sonicadvance1/fix-memoryutil-check

Fixes a check for what mmap returns.

Source/Core/Common/MemoryUtil.cpp

@@ -54,13 +54,13 @@ void* AllocateExecutableMemory(size_t size, bool low)
 	// printf("Mapped executable memory at %p (size %ld)\n", ptr,
 	//	(unsigned long)size);
 
-#if defined(__FreeBSD__)
-	if (ptr == MAP_FAILED)
+#ifdef _WIN32
+	if (ptr == nullptr)
 	{
-		ptr = nullptr;
 #else
-	if (ptr == nullptr)
+	if (ptr == MAP_FAILED)
 	{
+		ptr = nullptr;
 #endif
 		PanicAlert("Failed to allocate executable memory");
 	}