clover: Fix pipe_grid_info.indirect not being initialized.

clover: Fix pipe_grid_info.indirect not being initialized.

After pipe_grid_info.indirect was introduced, clover was not modified
to set it causing it to pass uninitialized memory for it to launch_grid.

This commit fixes this by zero-ing the entire pipe_grid_info struct when
declaring it, to avoid similar problems popping-up in the future.

Cc: "11.2" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
[ Francisco Jerez: Trivial codestyle fix. ]
Reviewed-by: Francisco Jerez <currojerez@riseup.net>