monitor/packet: Fix scan-build warnings

monitor/packet: Fix scan-build warnings

This fixes the following warnings:

monitor/packet.c:410:4: warning: Value stored to 'ts_pos' is never read
[deadcode.DeadStores]
                        ts_pos += n;
                        ^         ~
monitor/packet.c:455:4: warning: Value stored to 'pos' is never read
[deadcode.DeadStores]
                        pos += n;
                        ^      ~
monitor/packet.c:7477:2: warning: Value stored to 'mask' is never read
[deadcode.DeadStores]
        mask = tx_phys;
        ^      ~~~~~~~
monitor/packet.c:7485:2: warning: Value stored to 'mask' is never read
[deadcode.DeadStores]
        mask = rx_phys;
        ^      ~~~~~~~
monitor/packet.c:11229:3: warning: Value stored to 'str' is never read
[deadcode.DeadStores]
                str = "AoA Constant Tone Extension";
                ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
monitor/packet.c:11232:3: warning: Value stored to 'str' is never read
[deadcode.DeadStores]
                str = "AoA Constant Tone Extension with 1us slots";
                ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
monitor/packet.c:11235:3: warning: Value stored to 'str' is never read
[deadcode.DeadStores]
                str = "AoD Constant Tone Extension with 2us slots";
                ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
monitor/packet.c:11238:3: warning: Value stored to 'str' is never read
[deadcode.DeadStores]
                str = "No Constant Tone Extension";
                ^     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
monitor/packet.c:11241:3: warning: Value stored to 'str' is never read
[deadcode.DeadStores]
                str = "Reserved";
                ^     ~~~~~~~~~~
monitor/packet.c:11242:3: warning: Value stored to 'color_on' is never read
[deadcode.DeadStores]
                color_on = COLOR_RED;
                ^          ~~~~~~~~~

Signed-off-by: Manika Shrivastava <manika.sh@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>