serial: 8250_dma: call serial8250_tx_dma unconditionally
Since we have the same check inside the function we may drop it away in __dma_tx_complete(). Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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