drm/amd/display: Check denominator crb_pipes before used

commit ea79068d4073bf303f8203f2625af7d9185a1bc6 upstream.

[WHAT & HOW]
A denominator cannot be 0, and is checked before used.

This fixes 2 DIVIDE_BY_ZERO issues reported by Coverity.

Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Jerry Zuo <[email protected]>
Signed-off-by: Alex Hung <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
Signed-off-by: Cliff Liu <[email protected]>
Signed-off-by: He Zhe <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Alex Hung

drivers/gpu/drm/amd/display/dc/dcn315/dcn315_resource.c

@@ -1772,7 +1772,7 @@ static int dcn315_populate_dml_pipes_from_context(
 				bool split_required = pipe->stream->timing.pix_clk_100hz >= dcn_get_max_non_odm_pix_rate_100hz(&dc->dml.soc)
 						|| (pipe->plane_state && pipe->plane_state->src_rect.width > 5120);
 
-				if (remaining_det_segs > MIN_RESERVED_DET_SEGS)
+				if (remaining_det_segs > MIN_RESERVED_DET_SEGS && crb_pipes != 0)
 					pipes[pipe_cnt].pipe.src.det_size_override += (remaining_det_segs - MIN_RESERVED_DET_SEGS) / crb_pipes +
 							(crb_idx < (remaining_det_segs - MIN_RESERVED_DET_SEGS) % crb_pipes ? 1 : 0);
 				if (pipes[pipe_cnt].pipe.src.det_size_override > 2 * DCN3_15_MAX_DET_SEGS) {