ext4: don't show commit interval if it is zero

If commit interval is 0, it means using default value.

Fixes: 6e47a3cc ("ext4: get rid of super block and sbi from handle_mount_ops()")
Signed-off-by: Wang Jianjian <wangjianjian3@huawei.com>
Link: https://lore.kernel.org/r/20221219015128.876717-1-wangjianjian3@huawei.comSigned-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/super.c

@@ -2146,7 +2146,7 @@ static int ext4_parse_param(struct fs_context *fc, struct fs_parameter *param)
 		return 0;
 	case Opt_commit:
 		if (result.uint_32 == 0)
-			ctx->s_commit_interval = JBD2_DEFAULT_MAX_COMMIT_AGE;
+			result.uint_32 = JBD2_DEFAULT_MAX_COMMIT_AGE;
 		else if (result.uint_32 > INT_MAX / HZ) {
 			ext4_msg(NULL, KERN_ERR,
 				 "Invalid commit interval %d, "