rxrpc: Fix error when reading rxrpc tokens

When converting from ASSERTCMP to WARN_ON, the tested condition must
be inverted, which was missed for this case.

This would cause an EIO error when trying to read an rxrpc token, for
instance when trying to display tokens with AuriStor's "tokens" command.

Fixes: 84924aa ("rxrpc: Fix checker warning")
Signed-off-by: Marc Dionne <[email protected]>
Signed-off-by: David Howells <[email protected]>
cc: "David S. Miller" <[email protected]>
cc: Eric Dumazet <[email protected]>
cc: Jakub Kicinski <[email protected]>
cc: Paolo Abeni <[email protected]>
cc: [email protected]
cc: [email protected]
Signed-off-by: David S. Miller <[email protected]>

Author: Marc Dionne

net/rxrpc/key.c

@@ -680,7 +680,7 @@ static long rxrpc_read(const struct key *key,
 			return -ENOPKG;
 		}
 
-		if (WARN_ON((unsigned long)xdr - (unsigned long)oldxdr ==
+		if (WARN_ON((unsigned long)xdr - (unsigned long)oldxdr !=
 			    toksize))
 			return -EIO;
 	}