[NET]: Remove more unneeded typecasts on *malloc()

This removes more unneeded casts on the return value for kmalloc(),
sock_kmalloc(), and vmalloc().

Signed-off-by: Kris Katterjohn <kjak@users.sourceforge.net>
Acked-by: James Morris <jmorris@namei.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index f9573eb..556c495 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1287,7 +1287,7 @@
 			- (bodysize % SCTP_COOKIE_MULTIPLE);
 	*cookie_len = headersize + bodysize;
 
-	retval = (sctp_cookie_param_t *)kmalloc(*cookie_len, GFP_ATOMIC);
+	retval = kmalloc(*cookie_len, GFP_ATOMIC);
 
 	if (!retval) {
 		*cookie_len = 0;