r600/sfn: Initialize FragmentShaderFromNir member m_pos_input.
Fix defect reported by Coverity Scan.
Uninitialized pointer field (UNINIT_CTOR) uninit_member: Non-static class member m_pos_input is not initialized in this constructor nor in any functions that it calls.
Fixes: 374bc767 ("r600/sfn: Add the position input as varying") Signed-off-by: Vinson Lee vlee@freedesktop.org
cc: @gerddie