ging: gdm72xx: Simplify spinlock fix for gdm_usb_send_complete

This patch simplifies the previous patch (commit
dd13c86b0dae86efdde98119ffd7348e80719ade) for fixing the spinlock
recursion issue on several call sites of gdm_usb_send_complete.

Signed-off-by: Ben Chan <benchan@chromium.org>
Cc: Sage Ahn <syahn@gctsemi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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