USB: serial: remove redundant OOM messages

Remove redundant error messages on allocation failures, which have
already been logged.

Cc: Joe Perches <joe@perches.com>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/usb/serial/ch341.c
Simple merge

diff --cc drivers/usb/serial/console.c
Simple merge

diff --cc drivers/usb/serial/cp210x.c
Simple merge

diff --cc drivers/usb/serial/ftdi_sio.c
Simple merge

diff --cc drivers/usb/serial/garmin_gps.c
Simple merge

diff --cc drivers/usb/serial/io_edgeport.c
Simple merge

diff --cc drivers/usb/serial/io_ti.c
Simple merge

diff --cc drivers/usb/serial/ir-usb.c
Simple merge

diff --cc drivers/usb/serial/keyspan.c
Simple merge

diff --cc drivers/usb/serial/kl5kusb105.c
Simple merge

diff --cc drivers/usb/serial/mos7720.c
Simple merge

diff --cc drivers/usb/serial/mos7840.c
Simple merge

diff --cc drivers/usb/serial/opticon.c
Simple merge

diff --cc drivers/usb/serial/oti6858.c
Simple merge

diff --cc drivers/usb/serial/pl2303.c
Simple merge

diff --cc drivers/usb/serial/quatech2.c
Simple merge

diff --cc drivers/usb/serial/sierra.c
Simple merge

diff --cc drivers/usb/serial/ti_usb_3410_5052.c
Simple merge

diff --cc drivers/usb/serial/usb_wwan.c
Simple merge

diff --cc drivers/usb/serial/visor.c
Simple merge

diff --cc drivers/usb/serial/whiteheat.c
Simple merge