Cleanup: redundant 'break', minor edits

source/blender/blenkernel/intern/data_transfer.c

@@ -357,7 +357,6 @@ static MeshRemapIslandsCalc data_transfer_get_loop_islands_generator(const int c
 	switch (cddata_type) {
 		case CD_FAKE_UV:
 			return BKE_mesh_calc_islands_loop_poly_uv;
-			break;
 		default:
 			break;
 	}

source/blender/blenkernel/intern/unit.c

@@ -512,10 +512,8 @@ static bool ch_is_op(char op)
 		case '=':
 		case '%':
 			return true;
-			break;
 		default:
 			return false;
-			break;
 	}
 }