ethtool: rss: fix falsely ignoring indir table updates

ethtool: rss: fix falsely ignoring indir table updates

rss_set_prep_indir() compares the new indirection table against the
current one to determine whether any update is needed. The memcmp
call passes data->indir_size as the length argument, but indir_size
is the number of u32 entries, not the byte count.

Fixes: c0ae03588bbb ("ethtool: rss: initial RSS_SET (indirection table handling)")
Link: https://patch.msgid.link/20260522230647.1705600-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>