[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 <[email protected]>
Acked-by: James Morris <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
16 files changed