lib/edid: Don't set vbe_valid in decode_edid.

Decoding EDID doesn't yet mean that gfx mode is used.

Change-Id: Icedd36f26877754f34dd59233cce72271d7f0b19
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/5269
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/lib/edid.c b/src/lib/edid.c
index 91ff972..623081e 100644
--- a/src/lib/edid.c
+++ b/src/lib/edid.c
@@ -1253,7 +1253,7 @@
 		}
 
 		printk(BIOS_SPEW, "Checksum\n");
-		vbe_valid = do_checksum(edid);
+		do_checksum(edid);
 		for(i = 0; i < size; i += 128)
 			nonconformant_extension = parse_extension(out, &edid[i]);
 /*