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James Harvey's memory leak patch for Flip.

[originally from svn r5980]

--- a/flip.c

+++ b/flip.c

@@ -590,6 +590,8 @@

     sprintf(ret, "%s,%s", mbmp, gbmp);

     sfree(mbmp);

     sfree(gbmp);

+    sfree(matrix);

+    sfree(grid);

     return ret;

 }

@@ -731,6 +733,7 @@

 		if (equations[j * (wh+1) + wh]) {

 		    *error = "No solution exists for this position";

 		    sfree(equations);

+		    sfree(und);

 		    return NULL;

 		}

 	    break;

@@ -852,6 +855,7 @@

     sfree(shortest);

     sfree(solution);

     sfree(equations);

+    sfree(und);

     return ret;

 }