Simplify evaluation of the select ENUM.

src/vmod_selector.c

@@ -429,16 +429,20 @@ select(VRT_CTX, const struct match_data * const restrict match,
        const char * const restrict obj, VCL_ENUM const restrict selects,
        const char * const restrict method)
 {
-	if (selects == vmod_enum_UNIQUE) {
-		if (match->n != 1) {
-			VERR(ctx, "%s.%s(select=UNIQUE): "
-			     "%d elements were matched", obj, method, match->n);
-			return (UINT_MAX);
-		}
+	if (selects == vmod_enum_EXACT) {
+		if (match->exact == UINT_MAX)
+			VERR(ctx, "%s.%s(select=EXACT): "
+			     "no element matched exactly", obj, method);
+		return match->exact;
+	}
+	if (match->n == 1)
 		return match->indices[0];
+
+	if (selects == vmod_enum_UNIQUE) {
+		VERR(ctx, "%s.%s(select=UNIQUE): %d elements were matched",
+		     obj, method, match->n);
+		return (UINT_MAX);
 	}
-	if (selects == vmod_enum_EXACT)
-		return match->exact;
 	if (selects == vmod_enum_FIRST)
 		return match->min;
 	if (selects == vmod_enum_LAST)