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YUV: remove useless casts

--- a/yuv.c

+++ b/yuv.c

@@ -11,12 +11,12 @@

 	for(y = 0; y < height-1; y += 2){

 		for(x = 0; x < width-1; x += 2){

-			cb1 = (int)*U - 0x80;

-			cr1 = (int)*V - 0x80;

+			cb1 = *U - 0x80;

+			cr1 = *V - 0x80;

 			go = 22554*cb1 + 46802*cr1;

 #define ONE do{ \

-			yy1 = (int)*Y * 0x10101; \

+			yy1 = *Y * 0x10101; \

 			b = yy1 + 116130*cb1; \

 			RGB[0] = (b >> 24) ? ~(b >> 31) : (b>>16); \

 			g = yy1 - go; \