[PATCH] FD_CLOEXEC fcntl cleanup

This fixes a minor problem with fcntl.

get_close_on_exec() uses FD_ISSET() to determine the fd state, but this
is not guaranteed to be either 0 of FD_CLOEXEC.  Make that explicit.

Also, the argument of set_close_on_exec() is being AND'ed with the
literal constant 1.  Make it use an explicit FD_CLOEXEC test.

fs/fcntl.c

@@ -293,11 +293,11 @@ static long do_fcntl(unsigned int fd, unsigned int cmd,
 			err = dupfd(filp, arg);
 			break;
 		case F_GETFD:
-			err = get_close_on_exec(fd);
+			err = get_close_on_exec(fd) ? FD_CLOEXEC : 0;
 			break;
 		case F_SETFD:
 			err = 0;
-			set_close_on_exec(fd, arg&1);
+			set_close_on_exec(fd, arg & FD_CLOEXEC);
 			break;
 		case F_GETFL:
 			err = filp->f_flags;