etraxfs_eth: correct use of ! and &

Combining bitwise AND and logical NOT is suspicious.

Fixed by this Coccinelle script:
// From http://article.gmane.org/gmane.linux.kernel/646367
@@ expression E1,E2; @@
(
 !E1 & !E2
|
- !E1 & E2
+ !(E1 & E2)
)

Acked-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

hw/etraxfs_eth.c

@@ -464,7 +464,7 @@ static int eth_match_groupaddr(struct fs_eth *eth, const unsigned char *sa)
 
 	/* First bit on the wire of a MAC address signals multicast or
 	   physical address.  */
-	if (!m_individual && !sa[0] & 1)
+	if (!m_individual && !(sa[0] & 1))
 		return 0;
 
 	/* Calculate the hash index for the GA registers. */