build

[host] app: fix unchecked return value #2401

Job	Run time
host-linux	32s
host-windows-cross	54s
client (gcc, g++, xdg-shell, Release)	48s
docs	39s
host-windows-native	1m 20s
client (gcc, g++, xdg-shell, Debug)	48s
module	14s
obs (gcc)	32s
client (gcc, g++, libdecor, Release)	1m 13s
obs (clang)	38s
client (gcc, g++, libdecor, Debug)	57s
client (clang, clang++, xdg-shell, Release)	58s
client (clang, clang++, xdg-shell, Debug)	56s
client (clang, clang++, libdecor, Release)	1m 7s
client (clang, clang++, libdecor, Debug)	44s
	12m 20s

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