CI: Print out unmigrated symbols when failing

To make addressing the problem of migrated symbols being present in
board config header files, update the CI test to them print what symbols
are causing it to fail.  Also report all failures in the tree, rather
than stopping at the first failing file.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index 314d277..ec77c7a 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -63,6 +63,7 @@
       - script: |
           KSYMLST=`mktemp`
           KUSEDLST=`mktemp`
+          RET=0
           cat `find . -name "Kconfig*"` | \
              sed -n -e 's/^\s*config *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
              -e 's/^\s*menuconfig *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
@@ -76,10 +77,12 @@
              NUM=`comm -123 --total --output-delimiter=, ${KSYMLST} ${KUSEDLST} | \
                 cut -d , -f 3`
              if [[ $NUM -ne 0 ]]; then
-                echo "Unmigrated symbols found in $CFG"
-                exit 1
+                echo "Unmigrated symbols found in $CFG:"
+                comm -12 ${KSYMLST} ${KUSEDLST}
+                RET=1
              fi
           done
+          exit $RET
 
   - job: cppcheck
     displayName: 'Static code analysis with cppcheck'