usb: net2280 can't have a function called show_registers()

net2280 can't have a function called show_registers() because this can produce
a namespace clash with an arch function of the same name.

All this driver's functions and variables should really be prefixed with
"net2280_" to avoid such a problem in future.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Greg KH <greg@kroah.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>