Re-added the unlock since now returning rather than just loggging the…

… transform error.

Signed-off-by: Jean-Noël Moyne <[email protected]>

server/stream.go

@@ -1846,6 +1846,7 @@ func (mset *stream) updateWithAdvisory(config *StreamConfig, sendAdvisory bool)
 							var err error
 							si.trs[i], err = NewSubjectTransform(s.SubjectTransforms[i].Source, s.SubjectTransforms[i].Destination)
 							if err != nil {
+								mset.mu.Unlock()
 								return fmt.Errorf("unable to get subject transform for source: %v", err)
 							}
 						}