The incriminated commit broke the detection of new symbols skipping the
EXPERIMENTAL step before entering a stable abi section.
sed won't return an error, check a null output instead.

Fixes: 3630757803ab ("devtools: accept experimental symbol promotion")
Cc: sta...@dpdk.org

Signed-off-by: David Marchand <david.march...@redhat.com>
---
 devtools/check-symbol-change.sh | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/devtools/check-symbol-change.sh b/devtools/check-symbol-change.sh
index 9ada81e..116c311 100755
--- a/devtools/check-symbol-change.sh
+++ b/devtools/check-symbol-change.sh
@@ -111,15 +111,24 @@ check_for_rule_violations()
 
                        # A symbol can not enter a non experimental
                        # section directly
-                       if [ $? -ne 0 ] && [ "$secname" != 'EXPERIMENTAL' ]
+                       if [ -z "$oldsecname" ]
                        then
-                               echo -n "ERROR: symbol $symname "
-                               echo -n "is added in the $secname "
-                               echo -n "section, but is expected to "
-                               echo -n "be added in the EXPERIMENTAL "
-                               echo "section of the version map"
-                               ret=1
-                               continue
+                               if [ "$secname" = 'EXPERIMENTAL' ]
+                               then
+                                       echo -n "INFO: symbol $symname has "
+                                       echo -n "been added to the "
+                                       echo -n "EXPERIMENTAL section of the "
+                                       echo "version map"
+                                       continue
+                               else
+                                       echo -n "ERROR: symbol $symname "
+                                       echo -n "is added in the $secname "
+                                       echo -n "section, but is expected to "
+                                       echo -n "be added in the EXPERIMENTAL "
+                                       echo "section of the version map"
+                                       ret=1
+                                       continue
+                               fi
                        fi
 
                        # This symbol is moving inside a section, nothing to do
-- 
1.8.3.1

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