prevent a segfault in mod_basic if someone calls basic from CLI w/ no args

src/mod/languages/mod_basic/mod_basic.c

@@ -319,6 +319,7 @@ SWITCH_STANDARD_APP(basic_function)
 
 	if (zstr(file)) {
 		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "missing file\n");
+		goto DONE;
 	}
 
 	if (!switch_is_file_path(file)) {
@@ -347,7 +348,8 @@ SWITCH_STANDARD_APP(basic_function)
 	}
 
 	mb_close(&bi);
-	
+
+DONE:
 	switch_safe_free(fdup);
 	switch_safe_free(mydata);
 }