treewide: typo 'interrrupt' word corrections.

Signed-off-by: Justin P. Mattock <justinmattock@gmail.com>
Signed-off-by: Vitaliy Ivanov <vitalivanov@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/tty/serial/mrst_max3110.c b/drivers/tty/serial/mrst_max3110.c
index a764bf9..fbd9261 100644
--- a/drivers/tty/serial/mrst_max3110.c
+++ b/drivers/tty/serial/mrst_max3110.c
@@ -23,7 +23,7 @@
  *    1 word. If SPI master controller doesn't support sclk frequency change,
  *    then the char need be sent out one by one with some delay
  *
- * 2. Currently only RX available interrrupt is used, no need for waiting TXE
+ * 2. Currently only RX available interrupt is used, no need for waiting TXE
  *    interrupt for a low speed UART device
  */