emit_xdot: squash a -Wswitch-default warning

This switch is exhaustive.

diff --git a/lib/common/emit.c b/lib/common/emit.c
index 281a8eb8ac06bd1e3141e7ce4c9acbfc0453ccdc..261aefb49f2e89b7d90c05059f831b109f0d889e 100644 (file)
--- a/lib/common/emit.c
+++ b/lib/common/emit.c
@@ -21,6 +21,7 @@
 #include <math.h>
 #include <common/render.h>
 #include <cgraph/agxbuf.h>
+#include <cgraph/unreachable.h>
 #include <common/htmltable.h>
 #include <gvc/gvc.h>
 #include <cdt/cdt.h>
@@ -1576,6 +1577,8 @@ static void emit_xdot (GVJ_t * job, xdot* xd)
                image_warn = 0;
            }
            break;
+       default:
+           UNREACHABLE();
        }
        op++;
     }