security: keys: remove redundant assignment to key_ref

Variable key_ref is being assigned a value that is never read;
key_ref is being re-assigned a few statements later. Hence this
assignment is redundant and can be removed.

Signed-off-by: Colin Ian King <[e-mail]>
Signed-off-by: David Howells <[e-mail]>
Reviewed-by: James Morris <[e-mail]>

security/keys/key.c

···
 
 	key_check(keyring);
 
-	key_ref = ERR_PTR(-EPERM);
 	if (!(flags & KEY_ALLOC_BYPASS_RESTRICTION))
 		restrict_link = keyring->restrict_link;