[ATM]: fix sparse gfp nocast warnings

Fix implicit nocast warnings in atm code:
net/atm/atm_misc.c:35:44: warning: implicit cast to nocast type
drivers/atm/fore200e.c:183:33: warning: implicit cast to nocast type

Also use kzalloc() instead of kmalloc().

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/atm/atm_misc.c b/net/atm/atm_misc.c
index b2113c3..71abc99 100644
--- a/net/atm/atm_misc.c
+++ b/net/atm/atm_misc.c
@@ -25,7 +25,7 @@
 
 
 struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
-    int gfp_flags)
+    unsigned int __nocast gfp_flags)
 {
 	struct sock *sk = sk_atm(vcc);
 	int guess = atm_guess_pdu2truesize(pdu_size);