m68knommu: fix broken use of BUAD_TABLE_SIZE in 68328serial driver

Commit 8b505ca8 ("serial: 68328serial.c:
remove BAUD_TABLE_SIZE macro") misses one use of BAUD_TABLE_SIZE. So the
resulting 68328serial.c does not compile:

drivers/serial/68328serial.c: In function ‘m68328_console_setup’:
drivers/serial/68328serial.c:1439: error: ‘BAUD_TABLE_SIZE’ undeclared (first use in this function)
drivers/serial/68328serial.c:1439: error: (Each undeclared identifier is reported only once
drivers/serial/68328serial.c:1439: error: for each function it appears in.)

Fix that last use of it.
Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Cc: <stable@kernel.org>

drivers/serial/68328serial.c

@@ -1437,7 +1437,7 @@ int m68328_console_setup(struct console *cp, char *arg)
 	for (i = 0; i < ARRAY_SIZE(baud_table); i++)
 		if (baud_table[i] == n)
 			break;
-	if (i < BAUD_TABLE_SIZE) {
+	if (i < ARRAY_SIZE(baud_table)) {
 		m68328_console_baud = n;
 		m68328_console_cbaud = 0;
 		if (i > 15) {