vboot/sign_official_build: Fix missing backslash

Add the missing line continuation backslash, caused by CL:3046439.

BUG=b:198232639
TEST=./sign_official_build.sh recovery ${IMAGE} tests/devkeys/ ${OUTPUT}
TEST=./sign_official_build.sh factory ${IMAGE} tests/devkeys/ ${OUTPUT}
BRANCH=none

Change-Id: I587747e33c47afc85264052c9ca59081d5524a72
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3134894
Reviewed-by: Julius Werner <jwerner@chromium.org>
Commit-Queue: Julius Werner <jwerner@chromium.org>
diff --git a/scripts/image_signing/sign_official_build.sh b/scripts/image_signing/sign_official_build.sh
index 9fbc9a9..05be80d 100755
--- a/scripts/image_signing/sign_official_build.sh
+++ b/scripts/image_signing/sign_official_build.sh
@@ -1090,7 +1090,7 @@
     "${KEY_DIR}/recovery_kernel.keyblock" \
     "${KEY_DIR}/recovery_kernel_data_key.vbprivk" \
     "${KEY_DIR}/kernel.keyblock" \
-    "${KEY_DIR}/kernel_data_key.vbprivk"
+    "${KEY_DIR}/kernel_data_key.vbprivk" \
     "${KEY_DIR}/minios_kernel.keyblock" \
     "${KEY_DIR}/minios_kernel_data_key.vbprivk"
 elif [[ "${TYPE}" == "factory" ]]; then
@@ -1098,7 +1098,7 @@
     "${KEY_DIR}/installer_kernel.keyblock" \
     "${KEY_DIR}/installer_kernel_data_key.vbprivk" \
     "${KEY_DIR}/kernel.keyblock" \
-    "${KEY_DIR}/kernel_data_key.vbprivk"
+    "${KEY_DIR}/kernel_data_key.vbprivk" \
     "${KEY_DIR}/minios_kernel.keyblock" \
     "${KEY_DIR}/minios_kernel_data_key.vbprivk"
 elif [[ "${TYPE}" == "firmware" ]]; then