aoe: remove custom implementation of kbasename()

In the kernel we have a nice helper that may be used here. This patch
substitutes the custom implementation by the native function call.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/block/aoe/aoedev.c

@@ -12,6 +12,7 @@
 #include <linux/bitmap.h>
 #include <linux/kdev_t.h>
 #include <linux/moduleparam.h>
+#include <linux/string.h>
 #include "aoe.h"
 
 static void dummy_timer(ulong);
@@ -241,16 +242,12 @@ aoedev_downdev(struct aoedev *d)
 static int
 user_req(char *s, size_t slen, struct aoedev *d)
 {
-	char *p;
+	const char *p;
 	size_t lim;
 
 	if (!d->gd)
 		return 0;
-	p = strrchr(d->gd->disk_name, '/');
-	if (!p)
-		p = d->gd->disk_name;
-	else
-		p += 1;
+	p = kbasename(d->gd->disk_name);
 	lim = sizeof(d->gd->disk_name);
 	lim -= p - d->gd->disk_name;
 	if (slen < lim)