show_archive_content: Fix trivial memory leak

Fix trivial leak identified by coverity.  The program runs to exit and
the leak doesn't grow, but it's just cleaner to free the allocated
memory.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

locale/programs/locarchive.c

@@ -1742,6 +1742,7 @@ show_archive_content (const char *fname, int verbose)
 			: locnames[idx]);
 	      }
 	}
+      free (files);
     }
   else
     for (cnt = 0; cnt < used; ++cnt)