[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/socket.c b/net/socket.c
index 06fa217..b38a263 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -993,7 +993,7 @@
 
 	if (on)
 	{
-		fna=(struct fasync_struct *)kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
+		fna = kmalloc(sizeof(struct fasync_struct), GFP_KERNEL);
 		if(fna==NULL)
 			return -ENOMEM;
 	}