smb: client: Remove redundant check in smb2_is_path_accessible()

There is an unnecessary NULL check of cifs_sb in smb2_is_path_accessible(),
since cifs_sb is dereferenced multiple times prior to it.

It seems that there is no need to introduce any NULL checks of cifs_sb,
since arguments of smb2_is_path_accessible() are assumed to be non-NULL.

Therefore, this redundant check can be removed.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Ivan Abramov <i.abramov@mt-integration.ru>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: Ivan Abramov

fs/smb/client/smb2ops.c

@@ -969,7 +969,7 @@ smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 			if (islink)
 				rc = -EREMOTE;
 		}
-		if (rc == -EREMOTE && IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) && cifs_sb &&
+		if (rc == -EREMOTE && IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) &&
 		    (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS))
 			rc = -EOPNOTSUPP;
 		goto out;