Fix selftest::temp_source_file ctor

gcc/ChangeLog:
	* input.c (selftest::temp_source_file::temp_source_file): Fix
	missing "%s" in fprintf.

From-SVN: r238732

gcc/ChangeLog

+2016-07-25  David Malcolm  <dmalcolm@redhat.com>
+
+	* input.c (selftest::temp_source_file::temp_source_file): Fix
+	missing "%s" in fprintf.
+
 2016-07-25  John David Anglin  <danglin@gcc.gnu.org>
 
 	PR middle-end/71732

gcc/input.c

@@ -1175,7 +1175,7 @@ temp_source_file::temp_source_file (const location &loc, const char *suffix,
   if (!out)
     ::selftest::fail_formatted (loc, "unable to open tempfile: %s",
 				m_filename);
-  fprintf (out, content);
+  fprintf (out, "%s", content);
   fclose (out);
 }