xkbcomp: remove useless assignment ../../../src/xkbcomp/compat.c:693:16: warning: Although the value stored to 'merge' is used in the enclosing expression, the value is never actually read from 'merge' [deadcode.DeadStores] si.merge = merge = (def->merge == MERGE_DEFAULT ? merge : def->merge); Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>