scripts: fix ABI validator when revision is a tag

Commit 9cbae2aa64eb managed to break the only previously supported
case where a tag is used as a revision, due to git show output
differing between tags and other objects. The hash is on the last
line of the output in both cases though so just grab that.

Fixes: 9cbae2aa64eb ("scripts: support any git revisions as ABI validation range")

Signed-off-by: Panu Matilainen <pmatilai@redhat.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>

diff --git a/scripts/validate-abi.sh b/scripts/validate-abi.sh
index 8d7be24..c36ad61 100755 (executable)
--- a/scripts/validate-abi.sh
+++ b/scripts/validate-abi.sh
@@ -121,8 +121,8 @@ then
        cleanup_and_exit 1
 fi
 
-HASH1=$(git show -s --format=%H "$TAG1" -- 2> /dev/null)
-HASH2=$(git show -s --format=%H "$TAG2" -- 2> /dev/null)
+HASH1=$(git show -s --format=%H "$TAG1" -- 2> /dev/null | tail -1)
+HASH2=$(git show -s --format=%H "$TAG2" -- 2> /dev/null | tail -1)
 
 # Make sure our tags exist
 res=$(validate_tags)