[XFRM]: fix sparse gfp nocast warnings

Fix implicit nocast warnings in xfrm code:
net/xfrm/xfrm_policy.c:232:47: warning: implicit cast to nocast type

Signed-off-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index a9d0d8c..7564b2c 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -875,7 +875,7 @@
 } 
 #endif
 
-struct xfrm_policy *xfrm_policy_alloc(int gfp);
+struct xfrm_policy *xfrm_policy_alloc(unsigned int __nocast gfp);
 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
 struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index fda737d..c6a0d34 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -225,7 +225,7 @@
  * SPD calls.
  */
 
-struct xfrm_policy *xfrm_policy_alloc(int gfp)
+struct xfrm_policy *xfrm_policy_alloc(unsigned int __nocast gfp)
 {
 	struct xfrm_policy *policy;