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topng: fix crash due to uninitialized stack variable

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

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

@@ -21,7 +21,7 @@

 	Memimage *i;

 	int fd;

 	char *err, *filename;

-	ImageInfo II;

+	ImageInfo II = {0};

 	ARGBEGIN{

 	case 'c':

-- 

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