serial: sh-sci: Stop calling sci_start_rx() from sci_request_dma()

There's no need to call sci_start_rx() from sci_request_dma() when DMA
setup fails, as sci_startup() will call sci_start_rx() anyway.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/sh-sci.c

@@ -1386,7 +1386,6 @@ static void sci_request_dma(struct uart_port *port)
 				 "Failed to allocate Rx dma buffer, using PIO\n");
 			dma_release_channel(chan);
 			s->chan_rx = NULL;
-			sci_start_rx(port);
 			return;
 		}