LU-18034 build: compatibility updates for kernel 6.10

LU-18034 build: compatibility updates for kernel 6.10

Braces required around trivial conditional statements that devolve
to a single semi-colon (;).

static modifier should be the first modifier used.

Use 'static inline' or 'inline' modifier at the front
of declaration if inline is to be used.

const int func(), const is discarded and should not be used.

Test-Parameters: trivial
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: Iff67ff589e3ffde522c3b5bc03b1ec6705c6fc5c
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55728
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>