netprio_cgroup.c: fix comment typo

poitner -> pointer.
Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

net/core/netprio_cgroup.c

@@ -198,7 +198,7 @@ static int write_priomap(struct cgroup *cgrp, struct cftype *cft,
 
 	/*
 	 *Separate the devname from the associated priority
-	 *and advance the priostr poitner to the priority value
+	 *and advance the priostr pointer to the priority value
 	 */
 	*priostr = '\0';
 	priostr++;