staging: nvec: remove unnecessary 'else' after 'return' statement

Fix the following warning reported by checkpatch.pl:

WARNING: else is not generally useful after a break or return
235: FILE: drivers/staging/nvec/nvec.c:235
Signed-off-by: Pawel Lebioda <pawel.lebioda89@gmail.com>
Acked-by: Marc Dietrich <marvin24@gmx.de>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/nvec/nvec.c

@@ -232,7 +232,6 @@ static size_t nvec_msg_size(struct nvec_msg *msg)
 		return 2;
 	else if (event_length == NVEC_3BYTES)
 		return 3;
-	else
 	return 0;
 }