staging: wlan-ng: Replace pr_debug with netdev_dbg

This patch replace pr_debug with netdev_dbg when appropriate net_device
structure is found.
Issue found using the following Coccinelle script:

@r exists@
identifier f, s, i;
position p;
@@

f(...,struct s *i,...) {
<+... when != i == NULL
(
pr_err@p(...);
|
pr_info@p(...);
|
pr_debug@p(...);
)
...+>
}

@rr@
identifier r.s, fld;
@@

struct s {
	...
	struct net_device *fld;
	... };

@@
identifier r.i, r.s, rr.fld;
position r.p;
@@
(
-pr_err@p
+netdev_err
	(
+ i->fld,
...)
|
-pr_info@p
+netdev_info
	(
+ i->fld,
...)
|
-pr_debug@p
+netdev_dbg
	(
+ i->fld,
...)
)

Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>