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`Solve' operation on an already solved map without an aux_info was
returning NULL due to no moves being required, leading to a strange
error message. Trivial fix.

[originally from svn r6198]

--- a/map.c

+++ b/map.c

@@ -1563,8 +1563,10 @@

 	    return NULL;

 	}

-	retlen = retsize = 0;

-	ret = NULL;

+        retsize = 64;

+        ret = snewn(retsize, char);

+        strcpy(ret, "S");

+        retlen = 1;

 	for (i = 0; i < state->map->n; i++) {

             int len;

@@ -1574,8 +1576,7 @@

                 continue;

 	    assert(!state->map->immutable[i]);

-            len = sprintf(buf, "%s%d:%d", retlen ? ";" : "S;",

-			  colouring[i], i);

+            len = sprintf(buf, ";%d:%d", colouring[i], i);

             if (retlen + len >= retsize) {

                 retsize = retlen + len + 256;

                 ret = sresize(ret, retsize, char);