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telnetd: let the kernel place the shared segment in segattach() (thanks kenji arisawa)

--- a/sys/src/cmd/ip/telnetd.c

+++ b/sys/src/cmd/ip/telnetd.c

@@ -541,23 +541,17 @@

 }

 /*

- *  create a shared segment.  Make is start 2 meg higher than the current

- *  end of process memory.

+ *  create a shared segment.

  */

 void*

 share(ulong len)

 {

-	uchar *vastart;

+	void *v;

-	vastart = sbrk(0);

-	if(vastart == (void*)-1)

-		return 0;

-	vastart += 2*1024*1024;

-

-	if(segattach(0, "shared", vastart, len) == (void*)-1)

-		return 0;

-

-	return vastart;

+	v = segattach(0, "shared", 0, len);

+	if(v == (void*)-1)

+		return nil;

+	return v;

 }

 /*