USB: Standardize inclusion protection and add where missing.

For the header files in include/linux/usb, add missing multiple
inclusion protection and standardize what's already there.  The
apparent standards:

  * macro name of __LINUX_USB_headerfile_H
  * inclusion protection placed after leading comment block
  * macro name added as a comment on the final #endif
  * any obvious trivial whitespace cleanup associated with the above

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/include/linux/usb/g_printer.h b/include/linux/usb/g_printer.h
index 0c5ea1e..6178fde 100644
--- a/include/linux/usb/g_printer.h
+++ b/include/linux/usb/g_printer.h
@@ -18,6 +18,8 @@
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 
+#ifndef __LINUX_USB_G_PRINTER_H
+#define __LINUX_USB_G_PRINTER_H
 
 #define PRINTER_NOT_ERROR	0x08
 #define PRINTER_SELECTED	0x10
@@ -29,3 +31,5 @@
  */
 #define GADGET_GET_PRINTER_STATUS	_IOR('g', 0x21, unsigned char)
 #define GADGET_SET_PRINTER_STATUS	_IOWR('g', 0x22, unsigned char)
+
+#endif /* __LINUX_USB_G_PRINTER_H */