Processing (Windows): fix get current process

Author: CarterLi

src/common/processing_windows.c

@@ -169,7 +169,7 @@ bool ffProcessGetInfoWindows(uint32_t pid, uint32_t* ppid, FFstrbuf* pname, FFst
         ? GetCurrentProcess()
         : OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, pid);
 
-    if (hProcess == INVALID_HANDLE_VALUE)
+    if (hProcess == NULL)
         return false;
 
     if (gui)