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fix double free in exec

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

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

@@ -379,6 +379,8 @@

 		charp += n;

 	}

 	free(file0);

+	file0 = nil;	/* so waserror() won't free file0 */

+	USED(file0);

 	free(up->text);

 	up->text = elem;

@@ -458,13 +460,13 @@

 	 */

 	s = up->seg[ESEG];

 	up->seg[ESEG] = 0;

+	s->base = USTKTOP-USTKSIZE;

+	s->top = USTKTOP;

+	relocateseg(s, USTKTOP-TSTKTOP);

 	up->seg[SSEG] = s;

 	qunlock(&up->seglock);

 	poperror();	/* seglock */

 	poperror();	/* elem */

-	s->base = USTKTOP-USTKSIZE;

-	s->top = USTKTOP;

-	relocateseg(s, USTKTOP-TSTKTOP);

 	/*

 	 *  '/' processes are higher priority (hack to make /ip more responsive).

-- 

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