USB: remove warn() macro from usb drivers

USB should not be having it's own printk macros, so remove warn() and
use the system-wide standard of dev_warn() wherever possible.  In the
few places that will not work out, use a basic printk().

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/image/mdc800.c b/drivers/usb/image/mdc800.c
index 0fb114c..228552b 100644
--- a/drivers/usb/image/mdc800.c
+++ b/drivers/usb/image/mdc800.c
@@ -361,7 +361,8 @@
 	
 	if (mdc800->state == NOT_CONNECTED)
 	{
-		warn ("Camera gets disconnected during waiting for irq.");
+		printk(KERN_WARNING "mdc800: Camera gets disconnected "
+		       "during waiting for irq.\n");
 		mdc800->camera_request_ready=0;
 		return -2;
 	}
@@ -443,7 +444,7 @@
 
 	if (mdc800->dev != NULL)
 	{
-		warn ("only one Mustek MDC800 is supported.");
+		dev_warn(&intf->dev, "only one Mustek MDC800 is supported.\n");
 		return -ENODEV;
 	}
 
@@ -701,7 +702,8 @@
 	}
 	if (mdc800->state == WORKING)
 	{
-		warn ("Illegal State \"working\" reached during read ?!");
+		printk(KERN_WARNING "mdc800: Illegal State \"working\""
+		       "reached during read ?!\n");
 		mutex_unlock(&mdc800->io_lock);
 		return -EBUSY;
 	}