Peter Hurley f9d1083da0 serial: core: Cleanup uart_open() exit
If aborting uart_open() unsuccessfully, retval is non-zero, so the
existing fall-through exit is equivalent.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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