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fcp: fix wrong write pointer offset when read returns less than DEFB bytes

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

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

@@ -204,7 +204,7 @@

 			fprint(2, "reading %s at %lld: %r\n", from, o);

 			_exits("bad");

 		}

-		if(pwrite(fdt, buf, n, o) != n){

+		if(pwrite(fdt, bp, n, o) != n){

 			fprint(2, "writing %s: %r\n", to);

 			_exits("bad");

 		}