edid: fix warning

src/lib/edid.c:1177: error: ‘y’ may be used uninitialized in this function

Warning is bogus, but seems my gcc (4.4.7 as shipped by RHEL-6)
isn't clever enougth to figure this on its own.  So help a bit
by explicitly initializing the variable.

Change-Id: Ia9f966c9c0a6bd92a9f41f1a4a3c8e49f258be37
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-on: http://review.coreboot.org/3501
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/lib/edid.c b/src/lib/edid.c
index 460d68d..a794489 100644
--- a/src/lib/edid.c
+++ b/src/lib/edid.c
@@ -1174,7 +1174,7 @@
 		printk(BIOS_SPEW, "Standard timings supported:\n");
 		for (i = 0; i < 8; i++) {
 			uint8_t b1 = edid[0x26 + i * 2], b2 = edid[0x26 + i * 2 + 1];
-			unsigned int x, y, refresh;
+			unsigned int x, y = 0, refresh;
 
 			if (b1 == 0x01 && b2 == 0x01)
 				continue;