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

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 <[email protected]>
Signed-off-by: Marcel Ziswiler <[email protected]>
Acked-by: Marek Vasut <[email protected]>
Signed-off-by: Stefan Agner <[email protected]>
Signed-off-by: Marcel Ziswiler <[email protected]>