d: Fix missing call to va_end in getMatchError [PR99917]

Reviewed-on: https://github.com/dlang/dmd/pull/12380

gcc/d/ChangeLog:

	PR d/99917
	* dmd/MERGE: Merge upstream dmd d16195406.

gcc/d/dmd/MERGE

@@ -1,4 +1,4 @@
-5cc71ff830fcfba218152360014298550be9180e
+d16195406e1795ee91f2acb8f522fcb4ec698f47
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/dmd repository.

gcc/d/dmd/mtype.c

@@ -5220,6 +5220,7 @@ static const char *getMatchError(const char *format, ...)
     va_list ap;
     va_start(ap, format);
     buf.vprintf(format, ap);
+    va_end(ap);
     return buf.extractChars();
 }