$OpenBSD$

Index: third_party/emu2/src/dis.c
--- third_party/emu2/src/dis.c.orig
+++ third_party/emu2/src/dis.c
@@ -822,5 +822,6 @@ const char *disa(const uint8_t *ip, uint16_t reg_ip, i
     case 0xfd: return show(ip, "STD");
     case 0xfe: return decode_b(ip, table_fe[(ip[1] & 0x38) >> 3], segment_override);
     case 0xff: return decode_ff(ip, segment_override);
+    default: return NULL;
     }
 }
