ksmbd: uninterruptible wait for a file being unlocked

the wait can be canceled by SMB2_CANCEL, SMB2_CLOSE,
SMB2_LOGOFF, disconnection or shutdown, we don't have
to use wait_event_interruptible.

And this remove the warning from Coverity:

CID 1502834 (#1 of 1): Unused value (UNUSED_VALUE)
returned_value: Assigning value from ksmbd_vfs_posix_lock_wait(flock)
to err here, but that stored value is overwritten before it can be used.
Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/ksmbd/smb2pdu.c

@@ -6799,7 +6799,7 @@ int smb2_lock(struct ksmbd_work *work)
 
 				smb2_send_interim_resp(work, STATUS_PENDING);
 
-				err = ksmbd_vfs_posix_lock_wait(flock);
+				ksmbd_vfs_posix_lock_wait(flock);
 
 				if (work->state != KSMBD_WORK_ACTIVE) {
 					list_del(&smb_lock->llist);

fs/ksmbd/vfs.c

@@ -1784,9 +1784,9 @@ int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
 	return 0;
 }
 
-int ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
+void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
 {
-	return wait_event_interruptible(flock->fl_wait, !flock->fl_blocker);
+	wait_event(flock->fl_wait, !flock->fl_blocker);
 }
 
 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)

fs/ksmbd/vfs.h

@@ -168,7 +168,7 @@ int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
 				struct user_namespace *user_ns,
 				struct dentry *dentry,
 				struct ksmbd_kstat *ksmbd_kstat);
-int ksmbd_vfs_posix_lock_wait(struct file_lock *flock);
+void ksmbd_vfs_posix_lock_wait(struct file_lock *flock);
 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout);
 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock);
 int ksmbd_vfs_remove_acl_xattrs(struct user_namespace *user_ns,