Diff of /src/query/sortseq.cpp [b28eaf] .. [7876fb]

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--- a/src/query/sortseq.cpp
+++ b/src/query/sortseq.cpp
@@ -41,7 +41,7 @@
     } 
 };
 
-bool DocSeqSorted::setSortSpec(DocSeqSortSpec &sortspec)
+bool DocSeqSorted::setSortSpec(const DocSeqSortSpec &sortspec)
 {
     LOGDEB(("DocSeqSorted::setSortSpec\n"));
     m_spec = sortspec;