sb/intel/ibexpeak: Update debug code to match other chips

Other chips dump tco_status here if it wasn't handled, which makes
sense.

tco_sts can't be zero here, because the call would have already returned
if it were.  Also, dump_tco_status wouldn't print anything if tco_sts
were zero.

This will still only print the debug information if DEBUG_SMI is
enabled in Kconfig, so in general, this change won't have much of an
effect on anything.

Found-by: Coverity Scan #1229598
Change-Id: Id2c69a16817ba18dfa051f514138fbc04a2f7bee
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/18101
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/southbridge/intel/ibexpeak/smihandler.c

@@ -709,7 +709,7 @@ static void southbridge_smi_tco(void)
 	} else if (tco_sts & (1 << 3)) { /* TIMEOUT */
 		/* Handle TCO timeout */
 		printk(BIOS_DEBUG, "TCO Timeout.\n");
-	} else if (!tco_sts) {
+	} else {
 		dump_tco_status(tco_sts);
 	}
 }