Missing return after early exit

the exists code was plagued by a missing return statement meant to trigger an early exit.

Fixes: containers#7197

Signed-off-by: Brent Baude <bbaude@redhat.com>

pkg/api/handlers/libpod/containers.go

@@ -24,6 +24,7 @@ func ContainerExists(w http.ResponseWriter, r *http.Request) {
 	if err != nil {
 		if errors.Cause(err) == define.ErrNoSuchCtr {
 			utils.ContainerNotFound(w, name, err)
+			return
 		}
 		utils.InternalServerError(w, err)
 		return