drm/amd/display: Remove unreachable check

[WHY]
Coverity analysis flagged this code as DEADCODE
since the condition and return in the outer loop
are never reached.

All operations with the 'dwb_pipe' variable happen
in the inner loop, that already contains the same
check with the 'MAX_DWB_PIPES'. The later
check condition cannot occur before the check
condition in the inner loop, thus the later
condition is unreacable.

[HOW]
Remove the unreachable condition.
Acked-by: Zaeem Mohamed <zaeem.mohamed@amd.com>
Signed-off-by: Ivan Lipski <ivlipski@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/resource/dcn20/dcn20_resource.c

@@ -1666,8 +1666,6 @@ void dcn20_set_mcif_arb_params(
 			if (dwb_pipe >= MAX_DWB_PIPES)
 				return;
 		}
-		if (dwb_pipe >= MAX_DWB_PIPES)
-			return;
 	}
 }
 

drivers/gpu/drm/amd/display/dc/resource/dcn30/dcn30_resource.c

@@ -1419,10 +1419,7 @@ void dcn30_set_mcif_arb_params(
 			if (dwb_pipe >= MAX_DWB_PIPES)
 				return;
 		}
-		if (dwb_pipe >= MAX_DWB_PIPES)
-			return;
 	}
-
 }
 
 static struct dc_cap_funcs cap_funcs = {