libupnp: fix xlint warnings.
libupnp: fix xlint warnings.

Closes: #8106 [via git-merge-pr]

liwakura/void-packages,NeoChontrix/void-packages,NeoChontrix/void-packages,opsaaspo/void-packages,juliendehos/void-packages,coredumb/void-packages,opsaaspo/void-packages,floGik/void-packages,EaterOfCode/void-packages,opsaaspo/void-packages,EaterOfCode/void-packages,coredumb/void-packages,NeoChontrix/void-packages,floGik/void-packages,liwakura/void-packages,EaterOfCode/void-packages,NeoChontrix/void-packages,opsaaspo/void-packages,kulinacs/void-packages,necrophcodr/void-packages,EaterOfCode/void-packages,opsaaspo/void-packages,coredumb/void-packages,coredumb/void-packages,kulinacs/void-packages,coredumb/void-packages,kulinacs/void-packages,floGik/void-packages,EaterOfCode/void-packages,floGik/void-packages,necrophcodr/void-packages,kulinacs/void-packages,NeoChontrix/void-packages,necrophcodr/void-packages,kulinacs/void-packages,coredumb/void-packages,juliendehos/void-packages,floGik/void-packages,juliendehos/void-packages,necrophcodr/void-packages,necrophcodr/void-packages,kulinacs/void-packages,liwakura/void-packages,floGik/void-packages,liwakura/void-packages,liwakura/void-packages,liwakura/void-packages,opsaaspo/void-packages,juliendehos/void-packages,juliendehos/void-packages,NeoChontrix/void-packages,juliendehos/void-packages