Fix more rtai warnings #11476

Job	Run time
package-indep (debian:bullseye)	43m 19s
package-arch (debian:bullseye)	23m 23s
cppcheck	5m 47s
package-indep (debian:bookworm)	34m 42s
htmldocs	26m 18s
package-arch (debian:bookworm)	24m 26s
package-indep (debian:sid)	39m 0s
package-arch (debian:sid)	25m 6s
rip-and-test	24m 21s
rip-and-test-clang	21m 28s
	4h 27m 50s

Provide feedback