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devaoe: avoid panic on malloc() error by using smalloc() instead.

--- a/sys/src/9/port/devaoe.c

+++ b/sys/src/9/port/devaoe.c

@@ -1362,7 +1362,7 @@

 		return 0;

 	l = d->dl + i;

-	s = p = malloc(READSTR);

+	s = p = smalloc(READSTR);

 	e = s + READSTR;

 	p = seprint(p, e, "addr: ");

@@ -1398,7 +1398,7 @@

 	char *s, *p, *e;

 	Netlink *n;

-	s = p = malloc(READSTR);

+	s = p = smalloc(READSTR);

 	e = s + READSTR;

 	p = seprint(p, e, "debug: %d\n", debug);

@@ -1463,7 +1463,7 @@

 	if(len > sizeof d->config)

 		error(Etoobig);

 	srb = srballoc(len);

-	s = malloc(len);

+	s = smalloc(len);

 	memmove(s, db, len);

 	if(waserror()){

 		srbfree(srb);

@@ -1679,7 +1679,7 @@

 	case Qconfig:

 		if(off + n > sizeof d->config)

 			error(Etoobig);

-		buf = malloc(sizeof d->config);

+		buf = smalloc(sizeof d->config);

 		if(waserror()){

 			free(buf);

 			nexterror();