firewire: core: document fw_csr_string's truncation of long strings
firewire: core: document fw_csr_string's truncation of long strings

fw_csr_string() truncates and terminates target strings like strlcpy()
does.  Unlike strlcpy(), it returns the target strlen, not the source
strlen, hence users of fw_csr_string() are unable to detect truncation.

Point this behavior out in the kerneldoc comment.

Signed-off-by: Stefan Richter <fbd796546fc801b34e01e453c6fd30283e012038@s5r6.in-berlin.de>
Reviewed-by: Takashi Sakamoto <d5ec7d0cd8074757a1f5eb708bc105c3065a65ea@sakamocchi.jp>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs