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Mines: add validation for negative mine count.

If this gets through validation, it causes an infinite loop after
gameplay begins.

--- a/mines.c

+++ b/mines.c

@@ -258,6 +258,8 @@

      */

     if (full && params->unique && (params->w <= 2 || params->h <= 2))

 	return "Width and height must both be greater than two";

+    if (params->n < 0)

+	return "Mine count may not be negative";

     if (params->n > params->w * params->h - 9)

 	return "Too many mines for grid size";