In copy_fd when write fails we ought to close input file descriptor.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---

Found while looking at the source for inspiration for something else.
I did not see any error related to this.

	Sam

diff --git a/copy.c b/copy.c
index 7100eed..08a3d38 100644
--- a/copy.c
+++ b/copy.c
@@ -22,11 +22,14 @@ int copy_fd(int ifd, int ofd)
 				buf += written;
 				len -= written;
 			}
-			else if (!written)
+			else if (!written) {
+				close(ifd);
 				return error("copy-fd: write returned 0");
-			else
+			} else {
+				close(ifd);
 				return error("copy-fd: write returned %s",
 					     strerror(errno));
+			}
 		}
 	}
 	close(ifd);
-
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