buildkite: Fix path in post-checkout hook

The buildkite-agent actually clones the code in
${BUILDKITE_BUILD_CHECKOUT_PATH}. There is no need to add the
repository name.

Signed-off-by: Andreea Florescu <fandree@amazon.com>

Author: andreeaflorescu

.buildkite/hooks/post-checkout

@@ -3,7 +3,7 @@
 DEB_NAME="linux-image-4.9.0-9-amd64_4.9.168-1_amd64.deb"
 DEB_URL="http://ftp.debian.org/debian/pool/main/l/linux/${DEB_NAME}"
 
-REPO_PATH="${BUILDKITE_BUILD_CHECKOUT_PATH}/linux-loader"
+REPO_PATH="${BUILDKITE_BUILD_CHECKOUT_PATH}"
 DEB_PATH="${REPO_PATH}/${DEB_NAME}"
 EXTRACT_PATH="${REPO_PATH}/src/bzimage-archive"
 BZIMAGE_PATH="${EXTRACT_PATH}/boot/vmlinuz-4.9.0-9-amd64"
@@ -13,6 +13,7 @@ mkdir -p ${EXTRACT_PATH}
 wget $DEB_URL -P ${REPO_PATH}
 dpkg-deb -x ${DEB_PATH} ${EXTRACT_PATH}
 
+
 mv ${BZIMAGE_PATH} ${REPO_PATH}/src/loader/bzimage
 rm -r ${EXTRACT_PATH}
 rm -f ${DEB_PATH}