add a select callback on a clock from the search result

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
diff --git a/display.c b/display.c
index 1dc11dd..38596b0 100644
--- a/display.c
+++ b/display.c
@@ -447,9 +447,14 @@
 			string[strlen(string) - 1] = '\0';
 		break;
 
-	case KEY_ENTER:
-		/* next patch */
-		break;
+	case '\r':
+		if (!windata[current_win].ops || !windata[current_win].ops->selectf)
+			return 0;
+
+		if (windata[current_win].ops->selectf())
+			return -1;
+
+		return 0;
 
 	default: