fix: fw_env: Prevent writing error message on special files, which don't support fsync

According to fsync specification [1] some special files (e.g., a pipe, FIFO,
or socket) don't support synchronization and return either EROFS or EINVAL.

On the linux side the sys_fsync -> do_fsync() checks if the requested file
has f_op->fsync defined. If not it returns EINVAL [2].

This commit prevents writing error messages for files (devices), which
do not support fsync().

[1] - http://man7.org/linux/man-pages/man2/fsync.2.html
[2] - http://elixir.free-electrons.com/linux/v4.13-rc6/source/fs/sync.c#L183

Signed-off-by: Lukasz Majewski <lukma@denx.de>
Acked-by: Michael Heimpold <mhei@heimpold.de>

tools/env/fw_env.c

@@ -1088,14 +1088,16 @@ static int flash_io (int mode)
 
 		rc = flash_write (fd_current, fd_target, dev_target);
 
-		if (fsync (fd_current)) {
+		if (fsync(fd_current) &&
+		    !(errno == EINVAL || errno == EROFS)) {
 			fprintf (stderr,
 				 "fsync failed on %s: %s\n",
 				 DEVNAME (dev_current), strerror (errno));
 		}
 
 		if (HaveRedundEnv) {
-			if (fsync (fd_target)) {
+			if (fsync(fd_target) &&
+			    !(errno == EINVAL || errno == EROFS)) {
 				fprintf (stderr,
 					 "fsync failed on %s: %s\n",
 					 DEVNAME (dev_current), strerror (errno));