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diff: fix suicide if binary files don't diff

--- a/sys/src/cmd/diff/diffreg.c

+++ b/sys/src/cmd/diff/diffreg.c

@@ -356,10 +356,10 @@

 {

 	int m, i0, i1, j0, j1;

-	if(d->bindiff){

+	if(d->bindiff)

 		print("binary files %s %s differ\n", d->file1, d->file2);

+	if(d->binary)

 		return;

-	}

 	m = d->len[0];

 	d->J[0] = 0;

 	d->J[m+1] = d->len[1]+1;

-- 

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