mmc: mmci: Fix typo in comment

Delete the redundant word 'is'.
Signed-off-by: Xiang wangx <wangxiang@cdjrlc.com>
Link: https://lore.kernel.org/r/20220608130847.46359-1-wangxiang@cdjrlc.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/mmci.c

@@ -762,7 +762,7 @@ int mmci_dmae_setup(struct mmci_host *host)
 
 	/*
 	 * If only an RX channel is specified, the driver will
-	 * attempt to use it bidirectionally, however if it is
+	 * attempt to use it bidirectionally, however if it
 	 * is specified but cannot be located, DMA will be disabled.
 	 */
 	if (dmae->rx_channel && !dmae->tx_channel)