misc: warning cleanup

[pillo79]

Remove a few warnings about unused parameters, uninitialized variables and signed/unsigned mismatches detected by CI runs.

[github-actions]

Memory usage change @ 4cd6dfc

Board	flash	%	RAM for global variables	%
arduino:zephyr:unoq	💚 -8 - 0	-0.0 - 0.0	0 - 0	0.0 - 0.0

Click for full report table

Board	examples/client flash	%	examples/client RAM for global variables	%	examples/clientSSL flash	%	examples/clientSSL RAM for global variables	%	examples/hci flash	%	examples/hci RAM for global variables	%	examples/monitor flash	%	examples/monitor RAM for global variables	%	examples/server flash	%	examples/server RAM for global variables	%	examples/simple_bridge flash	%	examples/simple_bridge RAM for global variables	%	examples/test flash	%	examples/test RAM for global variables	%	examples/udp_ntp_client flash	%	examples/udp_ntp_client RAM for global variables	%
arduino:zephyr:unoq	-8	-0.0	0	0.0	0	0.0	0	0.0	-8	-0.0	0	0.0	-8	-0.0	0	0.0	0	0.0	0	0.0	0	0.0	0	0.0	-8	-0.0	0	0.0	-8	-0.0	0	0.0

Click for full report CSV

Board,examples/client<br>flash,%,examples/client<br>RAM for global variables,%,examples/clientSSL<br>flash,%,examples/clientSSL<br>RAM for global variables,%,examples/hci<br>flash,%,examples/hci<br>RAM for global variables,%,examples/monitor<br>flash,%,examples/monitor<br>RAM for global variables,%,examples/server<br>flash,%,examples/server<br>RAM for global variables,%,examples/simple_bridge<br>flash,%,examples/simple_bridge<br>RAM for global variables,%,examples/test<br>flash,%,examples/test<br>RAM for global variables,%,examples/udp_ntp_client<br>flash,%,examples/udp_ntp_client<br>RAM for global variables,%
arduino:zephyr:unoq,-8,-0.0,0,0.0,0,0.0,0,0.0,-8,-0.0,0,0.0,-8,-0.0,0,0.0,0,0.0,0,0.0,0,0.0,0,0.0,-8,-0.0,0,0.0,-8,-0.0,0,0.0

[eigen-value]

LGTM