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Fix a failure to warn about non-unique rows/columns in non-square Unruly grids, reported in Debian bug #718354.

[originally from svn r9976]

--- a/unruly.c

+++ b/unruly.c

@@ -1012,7 +1012,7 @@

         for (c = 0; c < nc; c++)

             if (state->grid[r*rmult + c*cmult] != EMPTY)

                 nfull++;

-        if (nfull != nr)

+        if (nfull != nc)

             continue;

         for (r2 = r+1; r2 < nr; r2++) {

             int match = TRUE;