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rc: rstr() shouldnt skip trailing NUL bytes (thanks ori)

--- a/sys/src/cmd/rc/io.c

+++ b/sys/src/cmd/rc/io.c

@@ -90,7 +90,7 @@

 		l = rchr(b);

 		if(l == EOF)

 			return 0;

-	} while(strchr(stop, l));

+	} while(l && strchr(stop, l));

 	b->bufp--;

 	s = 0;