ipv4: coding style: comparison for inequality with NULL

The ipv4 code uses a mixture of coding styles. In some instances check
for non-NULL pointer is done as x != NULL and sometimes as x. x is
preferred according to checkpatch and this patch makes the code
consistent by adopting the latter form.

No changes detected by objdiff.

Signed-off-by: Ian Morris <ipm@chirality.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 9e4a3e3..e13fcc6 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -391,9 +391,9 @@
 	BUG_ON(i >= child_length(tn));
 
 	/* update emptyChildren, overflow into fullChildren */
-	if (!n && chi != NULL)
+	if (!n && chi)
 		empty_child_inc(tn);
-	if (n != NULL && !chi)
+	if (n && !chi)
 		empty_child_dec(tn);
 
 	/* update fullChildren */