src/lib/edid.c: missing break statement

While vendor specific extension blocks are mostly opaque to us,
they're not exactly "unknown".

Change-Id: I9136c04d12045ad13ef4f942c0814c4df88bdf6b
Found-by: Coverity Scan
Signed-off-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-on: http://review.coreboot.org/6563
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
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 623081e..5c2d964 100644
--- a/src/lib/edid.c
+++ b/src/lib/edid.c
@@ -905,7 +905,7 @@
 	case 0x50: printk(BIOS_SPEW, "LS extension block\n"); break;
 	case 0x60: printk(BIOS_SPEW, "DPVL extension block\n"); break;
 	case 0xF0: printk(BIOS_SPEW, "Block map\n"); break;
-	case 0xFF: printk(BIOS_SPEW, "Manufacturer-specific extension block\n");
+	case 0xFF: printk(BIOS_SPEW, "Manufacturer-specific extension block\n"); break;
 	default:
 		printk(BIOS_SPEW, "Unknown extension block\n");
 		break;