selinux: Delete an unnecessary variable initialisation in range_read()

The local variable "rt" will be set to an appropriate pointer a bit later.
Thus omit the explicit initialisation at the beginning which became
unnecessary with a previous update step.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/selinux/ss/policydb.c

@@ -1841,7 +1841,7 @@ u32 string_to_av_perm(struct policydb *p, u16 tclass, const char *name)
 
 static int range_read(struct policydb *p, void *fp)
 {
-	struct range_trans *rt = NULL;
+	struct range_trans *rt;
 	struct mls_range *r = NULL;
 	int i, rc;
 	__le32 buf[2];