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doom: disable mouse grab on crash, prevent some crashed

--- a/sys/src/games/doom/i_video.c

+++ b/sys/src/games/doom/i_video.c

@@ -23,9 +23,20 @@

 static int kbdpid = -1;

 static int mousepid = -1;

+static void

+catch(void *, char *msg)

+{

+	/* in case we crash, disable mouse grab */

+	if(strncmp(msg, "sys:", 4) == 0)

+		mouseactive = 0;

+	noted(NDFLT);

+}

+

 void I_InitGraphics(void)

 {

 	int pid;

+

+	notify(catch);

 	if(initdraw(nil, nil, "doom") < 0)

 		I_Error("I_InitGraphics failed");

--- a/sys/src/games/doom/p_enemy.c

+++ b/sys/src/games/doom/p_enemy.c

@@ -1938,7 +1938,10 @@

     easy ^= 1;

     if (gameskill <= sk_easy && (!easy))

 	return;

-		

+

+    if (numbraintargets <= 0)

+        return;

+

     // shoot a cube at current target

     targ = braintargets[braintargeton];

     braintargeton = (braintargeton+1)%numbraintargets;

@@ -1977,6 +1980,8 @@

 	return;	// still flying

     targ = mo->target;

+    if (targ == 0)

+        return;

     // First spawn teleport fog.

     fog = P_SpawnMobj (targ->x, targ->y, targ->z, MT_SPAWNFIRE);