staging: comedi: serial2000: checkpatch.pl cleanup (missing blank line)

Fix the checkpatch.pl warning:

WARNING: Missing a blank line after declarations
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/serial2002.c

@@ -174,6 +174,7 @@ static int serial2002_tty_read(struct file *f, int timeout)
 		} else {
 			/* Device does not support poll, busy wait */
 			int retries = 0;
+
 			while (1) {
 				retries++;
 				if (retries >= timeout)
@@ -311,6 +312,7 @@ static void serial2002_write(struct file *f, struct serial_data data)
 	} else {
 		unsigned char ch[6];
 		int i = 0;
+
 		if (data.value >= (1L << 30)) {
 			ch[i] = 0x80 | ((data.value >> 30) & 0x03);
 			i++;