fs/fs.c: read up to EOF when len would read past EOF

http://lists.denx.de/pipermail/u-boot/2012-September/134347.html
allows for reading files in chunks from the shell.

When this feature is used to read past the end of a file an error
was returned instead of returning the bytes read up to the end of
file. Thus the following fails in the shell:

offset = 0
len = chunksize
do
	read file, offset, len
	write data
until bytes_read < len

The patch changes the behaviour to printing an informational
message and returning the actual read number of bytes aka read(2)
behaviour for convenient use in U-Boot scripts.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>

fs/fs.c

@@ -301,10 +301,8 @@ int fs_read(const char *filename, ulong addr, loff_t offset, loff_t len,
 	unmap_sysmem(buf);
 
 	/* If we requested a specific number of bytes, check we got it */
-	if (ret == 0 && len && *actread != len) {
-		printf("** Unable to read file %s **\n", filename);
-		ret = -1;
-	}
+	if (ret == 0 && len && *actread != len)
+		printf("** %s shorter than offset + len **\n", filename);
 	fs_close();
 
 	return ret;