test: fix some scan-build warnings
e.g. ../../../test/test-draglock.c:262:2: warning: Value stored to 'rc' is never read [deadcode.DeadStores] 262 | rc = draglock_init_from_string(&dl, "10");
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e.g. ../../../test/test-draglock.c:262:2: warning: Value stored to 'rc' is never read [deadcode.DeadStores] 262 | rc = draglock_init_from_string(&dl, "10");