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sam: fix memory leak

--- a/sys/src/cmd/sam/error.c

+++ b/sys/src/cmd/sam/error.c

@@ -138,7 +138,7 @@

 		else

 			Strinsert(&cmdstr, p, cmdstr.n);

 		cmdptadv += p->n;

-		free(p);

+		freetmpstr(p);

 	}else

 		Write(2, s, strlen(s));

 }

--- a/sys/src/cmd/sam/plan9.c

+++ b/sys/src/cmd/sam/plan9.c

@@ -136,10 +136,10 @@

 {

 	void *p;

-	p = malloc(n);

+	p = mallocz(n, 1);

 	if(p == 0)

 		panic("malloc fails");

-	memset(p, 0, n);

+	setmalloctag(p, getcallerpc(&n));

 	return p;

 }

@@ -149,5 +149,6 @@

 	p = realloc(p, n);

 	if(p == 0)

 		panic("realloc fails");

+	setmalloctag(p, getcallerpc(&p));

 	return p;

 }

-- 

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