pinctrl: core: Set ret to 0 when group is skipped

mainline inclusion
from mainline-v5.13-rc1
commit 6a37d750
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60OLE
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=6a37d750037827d385672acdebf5788fc2ffa633

--------------------------------

Static analyzer tool found that the ret variable is not initialized but
code expects ret value >=0 when pinconf is skipped in the first pinmux
loop. The same expectation is for pinmux in a pinconf loop.
That's why initialize ret to 0 to avoid uninitialized ret value in first
loop or reusing ret value from first loop in second.

Addresses-Coverity: ("Uninitialized variables")
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: NColin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/e5203bae68eb94b4b8b4e67e5e7b4d86bb989724.1615534291.git.michal.simek@xilinx.comSigned-off-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NYuyao Lin <linyuyao1@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/pinctrl/core.c

@@ -1266,6 +1266,7 @@ static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state)
 			break;
 		case PIN_MAP_TYPE_CONFIGS_PIN:
 		case PIN_MAP_TYPE_CONFIGS_GROUP:
+			ret = 0;
 			break;
 		default:
 			ret = -EINVAL;
@@ -1284,6 +1285,7 @@ static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state)
 	list_for_each_entry(setting, &state->settings, node) {
 		switch (setting->type) {
 		case PIN_MAP_TYPE_MUX_GROUP:
+			ret = 0;
 			break;
 		case PIN_MAP_TYPE_CONFIGS_PIN:
 		case PIN_MAP_TYPE_CONFIGS_GROUP: