Use WARN() in fs/proc/

Use WARN() instead of a printk+WARN_ON() pair; this way the message
becomes part of the warning section for better reporting/collection.
This way, the entire if() {} section can collapse into the WARN() as well.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/proc/generic.c

@@ -806,12 +806,9 @@ continue_removing:
 	if (S_ISDIR(de->mode))
 		parent->nlink--;
 	de->nlink = 0;
-	if (de->subdir) {
-		printk(KERN_WARNING "%s: removing non-empty directory "
+	WARN(de->subdir, KERN_WARNING "%s: removing non-empty directory "
 			"'%s/%s', leaking at least '%s'\n", __func__,
 			de->parent->name, de->name, de->subdir->name);
-		WARN_ON(1);
-	}
 	if (atomic_dec_and_test(&de->count))
 		free_proc_entry(de);
 }