cli.c: Fix tab completion of "module load" when MALLOC_DEBUG is enabled.

filename_completion_function() returns memory that was not allocated by
the MALLOC_DEBUG allocation tracker so the memory must be freed by
ast_std_free().
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Merged revisions 421600 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 421602 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 421608 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/13@421616 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/cli.c

@@ -239,7 +239,7 @@ static char *complete_fn(const char *word, int state)
 	if (c)
 		c = ast_strdup(c);
 
-	free(d);
+	ast_std_free(d);
 
 	return c;
 }