perf config: Refactor the code using 'ret' variable in cmd_config()

To simplify the code related to 'ret' variable in cmd_config(),
initialize 'ret' with -1 instead of 0 and use goto to perform resource
release at the end of the function, setting ret to zero just before the
out_err label, as usual in the kernel sources.
Signed-off-by: Taeung Song <treeze.taeung@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1497671202-20495-1-git-send-email-treeze.taeung@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/builtin-config.c

@@ -156,7 +156,7 @@ static int parse_config_arg(char *arg, char **var, char **value)
 
 int cmd_config(int argc, const char **argv)
 {
-	int i, ret = 0;
+	int i, ret = -1;
 	struct perf_config_set *set;
 	char *user_config = mkpath("%s/.perfconfig", getenv("HOME"));
 	const char *config_filename;
@@ -186,10 +186,8 @@ int cmd_config(int argc, const char **argv)
 	 * because of reinitializing with options config file location.
 	 */
 	set = perf_config_set__new();
-	if (!set) {
-		ret = -1;
+	if (!set)
 		goto out_err;
-	}
 
 	switch (actions) {
 	case ACTION_LIST:
@@ -197,10 +195,11 @@ int cmd_config(int argc, const char **argv)
 			pr_err("Error: takes no arguments\n");
 			parse_options_usage(config_usage, config_options, "l", 1);
 		} else {
-			ret = show_config(set);
-			if (ret < 0)
+			if (show_config(set) < 0) {
 				pr_err("Nothing configured, "
 				       "please check your %s \n", config_filename);
+				goto out_err;
+			}
 		}
 		break;
 	default:
@@ -215,38 +214,35 @@ int cmd_config(int argc, const char **argv)
 
 			if (!arg) {
 				pr_err("%s: strdup failed\n", __func__);
-				ret = -1;
-				break;
+				goto out_err;
 			}
 
 			if (parse_config_arg(arg, &var, &value) < 0) {
 				free(arg);
-				ret = -1;
-				break;
+				goto out_err;
 			}
 
 			if (value == NULL) {
-				ret = show_spec_config(set, var);
-				if (ret < 0) {
+				if (show_spec_config(set, var) < 0) {
 					pr_err("%s is not configured: %s\n",
 					       var, config_filename);
 					free(arg);
-					break;
+					goto out_err;
 				}
 			} else {
-				ret = set_config(set, config_filename, var, value);
-				if (ret < 0) {
+				if (set_config(set, config_filename, var, value) < 0) {
 					pr_err("Failed to set '%s=%s' on %s\n",
 					       var, value, config_filename);
 					free(arg);
-					break;
+					goto out_err;
 				}
 			}
 			free(arg);
 		}
 	}
 
-	perf_config_set__delete(set);
+	ret = 0;
 out_err:
+	perf_config_set__delete(set);
 	return ret;
 }