Fix va_start invocation

include/vlc_fixups.h

@@ -58,7 +58,7 @@ static inline int asprintf (char **strp, const char *fmt, ...)
 {
     va_list ap;
     int ret;
-    va_start (fmt, ap);
+    va_start (ap, fmt);
     ret = vasprintf (strp, fmt, ap);
     va_end (ap);
     return ret;