ksmbd: remove redundant DACL check in smb_check_perm_dacl

A zero value of pdacl->num_aces is already handled at the start of
smb_check_perm_dacl() so the second check is useless.

Drop the unreachable code block, no functional impact intended.

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

Signed-off-by: Alexey Velichayshiy <[e-mail]>
Acked-by: Namjae Jeon <[e-mail]>
Signed-off-by: Steve French <[e-mail]>

fs/smb/server/smbacl.c

···
 			granted |= le32_to_cpu(ace->access_req);
 			ace = (struct smb_ace *)((char *)ace + le16_to_cpu(ace->size));
 		}
-
-		if (!pdacl->num_aces)
-			granted = GENERIC_ALL_FLAGS;
 	}
 
 	if (!uid)