util: add fiemap fallback for errno ENOTTY

On WSL-1, genimage fails with (see [1] for details):

  ERROR: hdimage(sdcard.img): fiemap .../boot.vfat: 25 Inappropriate ioctl for device

This is because WSL-1 is a limited Linux emulation layer, where the fiemap
ioctl incorrectly returns ENOTTY instead of the expected EOPNOTSUPP.

[1] https://bugs.busybox.net/show_bug.cgi?id=13146

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
---
Changes v1 -> v2:
  - improved commit message (according to suggestion by Yann E. MORIN)

1 files changed, 1 insertions, 1 deletions

diff --git a/util.c b/util.c
index 381c5d9..2dcf396 100644
--- a/util.c
+++ b/util.c
@@ -387,7 +387,7 @@ err_out:
 	free(fiemap);
 
 	/* If failure is due to no filesystem support, return a single extent */
-	if (ret == -EOPNOTSUPP)
+	if (ret == -EOPNOTSUPP || ret == -ENOTTY)
 		return whole_file_exent(size, extents, extent_count);
 
 	image_error(image, "fiemap %s: %d %s\n", filename, errno, strerror(errno));