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Don't allow negative clues in Pattern

--- a/pattern.c

+++ b/pattern.c

@@ -913,6 +913,8 @@

                 p = desc;

                 while (*desc && isdigit((unsigned char)*desc)) desc++;

                 n = atoi(p);

+                if (n < 0)

+                    return "at least one clue is negative";

                 if (n > INT_MAX - 1)

                     return "at least one clue is grossly excessive";

                 rowspace -= n+1;