selinux: conditionally reschedule in hashtab_insert while loading selinux policy

After silencing the sleeping warning in mls_convert_context() I started
seeing similar traces from hashtab_insert. Do a cond_resched there too.
Signed-off-by: Dave Jones <davej@redhat.com>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>

security/selinux/ss/hashtab.c

@@ -6,6 +6,7 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
+#include <linux/sched.h>
 #include "hashtab.h"
 
 struct hashtab *hashtab_create(u32 (*hash_value)(struct hashtab *h, const void *key),
@@ -40,6 +41,8 @@ int hashtab_insert(struct hashtab *h, void *key, void *datum)
 	u32 hvalue;
 	struct hashtab_node *prev, *cur, *newnode;
 
+	cond_resched();
+
 	if (!h || h->nel == HASHTAB_MAX_NODES)
 		return -EINVAL;