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Fix mosaic's validate_desc: 9 is valid

This rejected valid games that include a '9' clue.

Fixes Android issue #582.

--- a/mosaic.c

+++ b/mosaic.c

@@ -840,7 +840,7 @@

     while (*curr_desc != '\0') {

         if (*curr_desc >= 'a' && *curr_desc <= 'z') {

             length += *curr_desc - 'a';

-        } else if (*curr_desc < '0' || *curr_desc >= '9')

+        } else if (*curr_desc < '0' || *curr_desc > '9')

             return "Invalid character in game description";

         length++;

         curr_desc++;