[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/include/linux/atmdev.h b/include/linux/atmdev.h
index 9f374cf..f1fd849 100644
--- a/include/linux/atmdev.h
+++ b/include/linux/atmdev.h
@@ -457,7 +457,7 @@
 
 int atm_charge(struct atm_vcc *vcc,int truesize);
 struct sk_buff *atm_alloc_charge(struct atm_vcc *vcc,int pdu_size,
-    int gfp_flags);
+    unsigned int __nocast gfp_flags);
 int atm_pcr_goal(struct atm_trafprm *tp);
 
 void vcc_release_async(struct atm_vcc *vcc, int reply);