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jpg: fix memory corruption

--- a/sys/src/cmd/jpg/readjpg.c

+++ b/sys/src/cmd/jpg/readjpg.c

@@ -488,8 +488,10 @@

 	/* flow chart C-2 */

 	nsize = 0;

-	for(i=0; i<16; i++)

-		nsize += b[1+i];

+	for(i=1; i<=16; i++)

+		nsize += b[i];

+	if(nsize == 0)

+		return 0;

 	t->size = jpgmalloc(h, (nsize+1)*sizeof(int), 1);

 	k = 0;

 	for(i=1; i<=16; i++){

-- 

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