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Game completion detection was occasionally failing to spot a
lingering GRID_UNKNOWN, causing it to declare victory too soon.

[originally from svn r4954]

--- a/pattern.c

+++ b/pattern.c

@@ -322,16 +322,16 @@

     n = 0;

     for (i = 0; i < len; i++) {

-        if (start[i*step] == GRID_UNKNOWN)

-            return -1;

-

         if (start[i*step] == GRID_FULL) {

             int runlen = 1;

-            while (i+runlen < len && start[(i+runlen)*step])

+            while (i+runlen < len && start[(i+runlen)*step] == GRID_FULL)

                 runlen++;

             ret[n++] = runlen;

             i += runlen;

         }

+

+        if (start[i*step] == GRID_UNKNOWN)

+            return -1;

     }

     return n;