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Patches from Ben Hutchings to fix failures of sscanf error checking.

[originally from svn r6147]

--- a/mines.c

+++ b/mines.c

@@ -2370,7 +2370,7 @@

 static void decode_ui(game_ui *ui, char *encoding)

 {

-    int p;

+    int p= 0;

     sscanf(encoding, "D%d%n", &ui->deaths, &p);

     if (encoding[p] == 'C')

 	ui->completed = TRUE;

--- a/pegs.c

+++ b/pegs.c

@@ -869,7 +869,7 @@

     int sx, sy, tx, ty;

     game_state *ret;

-    if (sscanf(move, "%d,%d-%d,%d", &sx, &sy, &tx, &ty)) {

+    if (sscanf(move, "%d,%d-%d,%d", &sx, &sy, &tx, &ty) == 4) {

 	int mx, my, dx, dy;

 	if (sx < 0 || sx >= w || sy < 0 || sy >= h)