RDKEMW-11023: fix the copilot static code analysis issues

[dkumar798]

Reason for Change: Fixed the copilot static code analysis issues
Risks: Low
Priority: P1
Signed-off-by:Dineshkumar P [[email protected]]

[Copilot]

Pull request overview

This PR addresses static code analysis issues identified by Copilot across three utility programs in the IARM (Inter-Application Resource Manager) codebase. The changes focus on improving code safety by adding proper validation checks for function pointers, system calls, and command-line argument access.

Key Changes:

• Added NULL checking for function pointers before invocation to prevent crashes
• Fixed floating-point to integer arithmetic conversion to avoid implicit type conversion warnings
• Added bounds checking for command-line argument access and system call return value validation

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
key_simulator/IARM_BUS_UIEventSimulator.c	Added NULL check for UINPUT dispatcher function pointer with error logging
iarm_set_powerstate/IARM_BUS_SetPowerStatus.c	Fixed floating-point arithmetic to use integer operations for usleep calculation
iarm_query_powerstate/IARM_Bus_CheckPowerStatus.c	Added bounds checking for argv array access and error handling for lseek system call

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[santoshcomcast]

Looks good to me, except for the cosmetic comment mentioned.