Fix usage of an uninitialized variable

	* lto-plugin.c (all_symbols_read_handler): Assign default
	value to a string variable.

From-SVN: r232426

lto-plugin/ChangeLog

+2016-01-15  Martin Liska  <mliska@suse.cz>
+
+	* lto-plugin.c (all_symbols_read_handler): Assign default
+	value to a string variable.
+
 2015-11-25  Jan Hubicka  <jh@suse.cz>
 
 	PR lto/67548

lto-plugin/lto-plugin.c

@@ -628,7 +628,7 @@ all_symbols_read_handler (void)
   unsigned num_lto_args
     = num_claimed_files + num_offload_files + lto_wrapper_num_args + 2;
   char **lto_argv;
-  const char *linker_output_str;
+  const char *linker_output_str = NULL;
   const char **lto_arg_ptr;
   if (num_claimed_files + num_offload_files == 0)
     return LDPS_OK;