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queries: fix partially-uninitialized struct #150

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The x instance wasn't initialized properly, which led to undefined
behaviour in _tgl_do_send_photo when copying its content to t->avatar.

This patch fixes that by using the C struct initializer syntax, which
implicitly sets all missing fields to 0.

Note that this UB triggers a compilation warning when compiling with
recent GCC versions in -O3.

The `x` instance wasn't initialized properly, which led to undefined
behaviour in _tgl_do_send_photo when copying its content to t->avatar.

This patch fixes that by using the C struct initializer syntax, which
implicitly sets all missing fields to 0.

Note that this UB triggers a compilation warning when compiling with
recent GCC versions in -O3.
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