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stream: check for nil stream before closing/reading

--- a/stream.c

+++ b/stream.c

@@ -44,7 +44,7 @@

 void

 Sclose(Stream *s)

 {

-	if(s->type < 0)

+	if(s == nil || s->type < 0)

 		return;

 	s->ops.close(s);

 	s->type = -1;

@@ -53,7 +53,7 @@

 int

 Sread(Stream *s, Streamframe *f)

 {

-	if(s->type < 0)

+	if(s == nil || s->type < 0)

 		return -1;

 	return s->ops.read(s, f);

 }