misc: remove extra va_end in error_tail (bug 32233)

This is an addendum to commit b7b52b9dec ("error, error_at_line: Add
missing va_end calls"), which added the va_end calls in the callers where
they belong.

misc/error.c

@@ -212,7 +212,6 @@ error_tail (int status, int errnum, const char *message, va_list args,
 #else
   vfprintf (stderr, message, args);
 #endif
-  va_end (args);
 
   ++error_message_count;
   if (errnum)