ipv6: coding style improvements (remove assignment in if statements)

This change has no functional impact and simply addresses some coding
style issues detected by checkpatch. Specifically this change
adjusts "if" statements which also include the assignment of a
variable.

No changes to the resultant object files result as determined by objdiff.

Signed-off-by: Ian Morris <ipm@chirality.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 2c9f6bf..6828667 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -162,7 +162,8 @@
 	memcpy(opt+2, data, data_len);
 	data_len += 2;
 	opt += data_len;
-	if ((space -= data_len) > 0)
+	space -= data_len;
+	if (space > 0)
 		memset(opt, 0, space);
 }
 
@@ -656,8 +657,8 @@
 
 	if (skb && ipv6_chk_addr(dev_net(dev), &ipv6_hdr(skb)->saddr, dev, 1))
 		saddr = &ipv6_hdr(skb)->saddr;
-
-	if ((probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES)) < 0) {
+	probes -= NEIGH_VAR(neigh->parms, UCAST_PROBES);
+	if (probes < 0) {
 		if (!(neigh->nud_state & NUD_VALID)) {
 			ND_PRINTK(1, dbg,
 				  "%s: trying to ucast probe in NUD_INVALID: %pI6\n",