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qr: fix exit status

Call exits(0) instead of returning from main.  Also call sysfatal if
writing of image data fails.  Previously, qr(1) would exit with
default non-nil status "main" unconditionally as a result of returning
from main.

--- a/sys/src/cmd/qr.c

+++ b/sys/src/cmd/qr.c

@@ -732,8 +732,11 @@

 	b = qrcode(ver, lev, mode, buf, rc, &s);

 	if(b == nil)

 		sysfatal("%r");

-	print("%11s %11d %11d %11d %11d ", "k8", 0, 0, s, s);

-	write(1, b, s * s);

+	if(print("%11s %11d %11d %11d %11d ", "k8", 0, 0, s, s) != 5*12)

+		sysfatal("print: %r");

+	if(write(1, b, s*s) != s*s)

+		sysfatal("write: %r");

+	exits(0);

 }

 uchar qrrawpolys[] = {

-- 

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