USB: ehci-omap: fix compile failure(v1)

The omap_ehci_init() is introduced in the below commit:

	commit 1a49e2ac(EHCI:
	centralize controller initialization)

the local variable of 'pdev' inside omap_ehci_init() is used
but not defined, so fix the compiling failure.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>