RDS: cleanup: remove "== NULL"s and "!= NULL"s in ptr comparisons

Favor "if (foo)" style over "if (foo != NULL)".

Signed-off-by: Andy Grover <andy.grover@oracle.com>
diff --git a/net/rds/tcp_recv.c b/net/rds/tcp_recv.c
index 1aba687..ea73829 100644
--- a/net/rds/tcp_recv.c
+++ b/net/rds/tcp_recv.c
@@ -190,10 +190,10 @@
 	 * processing.
 	 */
 	while (left) {
-		if (tinc == NULL) {
+		if (!tinc) {
 			tinc = kmem_cache_alloc(rds_tcp_incoming_slab,
 					        arg->gfp);
-			if (tinc == NULL) {
+			if (!tinc) {
 				desc->error = -ENOMEM;
 				goto out;
 			}
@@ -229,7 +229,7 @@
 
 		if (left && tc->t_tinc_data_rem) {
 			clone = skb_clone(skb, arg->gfp);
-			if (clone == NULL) {
+			if (!clone) {
 				desc->error = -ENOMEM;
 				goto out;
 			}
@@ -326,7 +326,7 @@
 
 	read_lock(&sk->sk_callback_lock);
 	conn = sk->sk_user_data;
-	if (conn == NULL) { /* check for teardown race */
+	if (!conn) { /* check for teardown race */
 		ready = sk->sk_data_ready;
 		goto out;
 	}
@@ -347,7 +347,7 @@
 	rds_tcp_incoming_slab = kmem_cache_create("rds_tcp_incoming",
 					sizeof(struct rds_tcp_incoming),
 					0, 0, NULL);
-	if (rds_tcp_incoming_slab == NULL)
+	if (!rds_tcp_incoming_slab)
 		return -ENOMEM;
 	return 0;
 }