global: Fix usage of get_option() to make use of CB_CMOS_ codes

Do not directly check the return value of get_option, but instead compare
the returned value against a CB_CMOS_ error code, or against CB_SUCCESS.

Change-Id: I2fa7761d13ebb5e9b4606076991a43f18ae370ad
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/4266
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/southbridge/intel/i82801ix/lpc.c b/src/southbridge/intel/i82801ix/lpc.c
index bea0d98..61a11b3 100644
--- a/src/southbridge/intel/i82801ix/lpc.c
+++ b/src/southbridge/intel/i82801ix/lpc.c
@@ -181,7 +181,7 @@
 	 *
 	 * If the option is not existent (Laptops), use MAINBOARD_POWER_ON.
 	 */
-	if (get_option(&pwr_on, "power_on_after_fail") < 0)
+	if (get_option(&pwr_on, "power_on_after_fail") != CB_SUCCESS)
 		pwr_on = MAINBOARD_POWER_ON;
 
 	reg8 = pci_read_config8(dev, D31F0_GEN_PMCON_3);