drivers: system_apic: Correctly assert interrupt line number
drivers: system_apic: Correctly assert interrupt line number

The interrupt line number is an unsigned integer; it makes no sense to
compare if it is greater than or equal to 0.

Coverity-CID: 182602
Signed-off-by: Leandro Pereira <51c7437a02b34df685e6b4ecb2e9bca23efe2e1a@intel.com>

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