API checkstyle is unhappy if the repo is not clean.
An example:
https://jenkins.fd.io/job/vpp-checkstyle-verify-master-ubuntu2004-x86_64/598/console
Output the changes to make diagnostics easier.
Change-Id: I3fe1dfd0adde47e2140151687a6ab31885fc851c
Signed-off-by: Andrew Yourtchenko <[email protected]>
 
 }
 
 if [ -f $VPP_CRC_CHECKER ]; then
+    # API checker complains if the git repo is not clean.
+    # Help diagnosing those issues easier
+    git --no-pager diff
     echo "Running $VPP_CRC_CHECKER_CMD"
     if $VPP_CRC_CHECKER_CMD; then
            echo "API check successful"