selinux: remove pointless cast in selinux_inode_setsecurity()

security_context_to_sid() expects a const char* argument, so there's
no point in casting away the const qualifier of value.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Acked-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <pmoore@redhat.com>

security/selinux/hooks.c

@@ -3163,7 +3163,7 @@ static int selinux_inode_setsecurity(struct inode *inode, const char *name,
 	if (!value || !size)
 		return -EACCES;
 
-	rc = security_context_to_sid((void *)value, size, &newsid, GFP_KERNEL);
+	rc = security_context_to_sid(value, size, &newsid, GFP_KERNEL);
 	if (rc)
 		return rc;