Use helpers to obtain task pid in printks

The task_struct->pid member is going to be deprecated, so start
using the helpers (task_pid_nr/task_pid_vnr/task_pid_nr_ns) in
the kernel.

The first thing to start with is the pid, printed to dmesg - in
this case we may safely use task_pid_nr(). Besides, printks produce
more (much more) than a half of all the explicit pid usage.

[akpm@linux-foundation.org: git-drm went and changed lots of stuff]
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Cc: Dave Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/net/wireless/hostap/hostap_ioctl.c

@@ -2920,7 +2920,7 @@ static int prism2_ioctl_priv_monitor(struct net_device *dev, int *i)
 
 	printk(KERN_DEBUG "%s: process %d (%s) used deprecated iwpriv monitor "
 	       "- update software to use iwconfig mode monitor\n",
-	       dev->name, current->pid, current->comm);
+	       dev->name, task_pid_nr(current), current->comm);
 
 	/* Backward compatibility code - this can be removed at some point */