Revert "split: use xopen_stdin()"

This reverts commit 5168bf2caac99fbbb499fb660f20e349c9c65c8c.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
diff --git a/coreutils/split.c b/coreutils/split.c
index 7c9c0c1..c2f3885 100644
--- a/coreutils/split.c
+++ b/coreutils/split.c
@@ -82,7 +82,9 @@
 		int fd;
 		if (argv[1])
 			sfx = argv[1];
-		fd = xopen_stdin(argv[0]);
+		fd = open_or_warn_stdin(argv[0]);
+		if (fd == -1)
+			return EXIT_FAILURE;
 		xmove_fd(fd, STDIN_FILENO);
 	} else {
 		argv[0] = (char *) bb_msg_standard_input;