radeon: fix computing difference

Also fix clang warning self-assign.

Pointed by clang.

Change-Id: I0e104420414fecece87015a0af9a4535ccfc8263
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2401
Reviewed-by: waddlesplash <[email protected]>

src/add-ons/accelerants/radeon/Acceleration.c

@@ -102,7 +102,7 @@ void SCREEN_TO_SCREEN_BLIT_PIO(engine_token *et, blit_params *list, uint32 count
 	}
 
 	++ai->si->engine.count;
-	et = et;
+	(void)et;
 
 }
 
@@ -180,7 +180,7 @@ void FILL_RECTANGLE_PIO(engine_token *et, uint32 colorIndex, fill_rect_params *l
 
 	}
 	++ai->si->engine.count;
-	et = et;
+	(void)et;
 }
 
 
@@ -263,7 +263,7 @@ void INVERT_RECTANGLE_PIO(engine_token *et, fill_rect_params *list, uint32 count
 	}
 
 	++ai->si->engine.count;
-	et = et;
+	(void)et;
 
 }
 
@@ -355,7 +355,7 @@ void FILL_SPAN_PIO(engine_token *et, uint32 colorIndex, uint16 *list, uint32 cou
 	}
 
 	++ai->si->engine.count;
-	et = et;
+	(void)et;
 }
 
 

src/add-ons/accelerants/radeon/pll.c

@@ -157,9 +157,9 @@ void Radeon_CalcPLLDividers(
 					ref_div * post_div );
 
 				// absolute error in terms of output clock
-				error = abs( cur_freq - freq );
+				error = abs( (int32)cur_freq - (int32)freq );
 				// deviation from perfect VCO clock
-				vco_dev = abs( vco - pll->best_vco );
+				vco_dev = abs( (int32)vco - (int32)(pll->best_vco) );
 
 				// if there is no optimal VCO frequency, choose setting with less error;
 				// if there is an optimal VCO frequency, choose new settings if
@@ -257,7 +257,7 @@ void Radeon_MatchCRTPLL(
 					Radeon_CalcPLLDividers( pll, crt_freq, fixed_post_div, dividers );
 
 					// get absolute CRT clock error per second
-					abs_crt_error = abs( dividers->freq - crt_freq );
+					abs_crt_error = abs( (int32)(dividers->freq) - (int32)crt_freq );
 
 					//SHOW_INFO( 2, "whished=%d, is=%d", crt_freq, dividers->freq );