kfifo: pass offset to setup_sgl_buf() instead of a pointer

kfifo: pass offset to setup_sgl_buf() instead of a pointer

As a preparatory for dma addresses filling, we need the data offset
instead of virtual pointer in setup_sgl_buf(). So pass the former
instead the latter.

And pointer to fifo is needed in setup_sgl_buf() now too.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Cc: Stefani Seibold <stefani@seibold.net>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: https://lore.kernel.org/r/20240405060826.2521-7-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>