net/sched: act_skbmod: convert comma to semicolon

Replace a comma between expression statements by a semicolon.

Signed-off-by: Chen Ni <nichen@iscas.ac.cn>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240709072838.1152880-1-nichen@iscas.ac.cn


Signed-off-by: Jakub Kicinski <kuba@kernel.org>