proc: remove proc_root from drivers

Remove proc_root export.  Creation and removal works well if parent PDE is
supplied as NULL -- it worked always that way.

So, one useless export removed and consistency added, some drivers created
PDEs with &proc_root as parent but removed them as NULL and so on.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/s390/char/tape_proc.c b/drivers/s390/char/tape_proc.c
index c9b96d5..0c39636 100644
--- a/drivers/s390/char/tape_proc.c
+++ b/drivers/s390/char/tape_proc.c
@@ -125,7 +125,7 @@
 {
 	tape_proc_devices =
 		create_proc_entry ("tapedevices", S_IFREG | S_IRUGO | S_IWUSR,
-				   &proc_root);
+				   NULL);
 	if (tape_proc_devices == NULL) {
 		PRINT_WARN("tape: Cannot register procfs entry tapedevices\n");
 		return;
@@ -141,5 +141,5 @@
 tape_proc_cleanup(void)
 {
 	if (tape_proc_devices != NULL)
-		remove_proc_entry ("tapedevices", &proc_root);
+		remove_proc_entry ("tapedevices", NULL);
 }