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xwayland: Fix out of bounds write

David Redondo requested to merge work/xvisitoverflow into master

Detected using ASAN, declaration of the type is:

typedef union xcb_client_message_data_t {
    uint8_t  data8[20];
    uint16_t data16[10];
    uint32_t data32[5];
} xcb_client_message_data_t;
Edited by David Redondo

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