[lib][console] Remove redundant NULL checks before free

[TzengKyle]

Summary

Remove redundant NULL checks before free() in lib/console/console.c.

In the no_mem_error path of command_loop(), free(outbuf) and free(args) are sufficient because free(NULL) is defined as a no-op in C. This simplifies the cleanup path without changing behavior.

Testing

-make qemu-virt-arm64-test

[Copilot]

Pull request overview

This PR simplifies the command_loop() cleanup path in LK’s console library by removing redundant NULL checks before calling free() in the no_mem_error: label.

Changes:

• Replace if (ptr) free(ptr); patterns with unconditional free(outbuf); free(args); in the no_mem_error cleanup path.
• Align the error-path cleanup style with the already-unconditional cleanup used on the normal return path in the same function.