usb: renesas_usbhs: cleanup with list_first_entry_or_null()

The combo of list_empty() check and return list_first_entry()
can be replaced with list_first_entry_or_null().

Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
(cherry picked from commit 31faf878bd8c7e2c078a3b75f65efe64f23b0f18)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
1 file changed