testing: Fix kernel download URL for kernel versions != 4.x

diff --git a/testing/scripts/build-guestkernel b/testing/scripts/build-guestkernel
index b408d73..17f22bd 100755 (executable)
--- a/testing/scripts/build-guestkernel
+++ b/testing/scripts/build-guestkernel
@@ -14,7 +14,7 @@ cd $BUILDDIR
 
 if [ ! -f "$KERNELTARBALL" ]
 then
-       url=ftp://ftp.kernel.org/pub/linux/kernel/v4.x/$KERNELTARBALL
+       url=ftp://ftp.kernel.org/pub/linux/kernel/v${KERNELVERSION:0:1}.x/$KERNELTARBALL
        log_action "Downloading $url"
        execute "wget -q $url"
 fi