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/sysctl.c b/net/rds/sysctl.c
index 7829a20..5a6dd81 100644
--- a/net/rds/sysctl.c
+++ b/net/rds/sysctl.c
@@ -111,7 +111,7 @@
 	rds_sysctl_reconnect_min_jiffies = rds_sysctl_reconnect_min;
 
 	rds_sysctl_reg_table = register_sysctl_paths(rds_sysctl_path, rds_sysctl_rds_table);
-	if (rds_sysctl_reg_table == NULL)
+	if (!rds_sysctl_reg_table)
 		return -ENOMEM;
 	return 0;
 }