[patch] serial: stm32: fix a type issue

[Russell King - ARM Linux]

On Wed, Oct 12, 2016 at 09:21:03AM +0300, Dan Carpenter wrote:
> We store UNDEF_REG in a u8.  It causes a problem in functions like
> stm32_tx_dma_complete() where we check "if (ofs->icr == UNDEF_REG)".
> 
> Fixes: 3489187204eb ('serial: stm32: adding dma support')

Correct form is:

Fixes: 12-digit-hash ("summary line")

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