libswscale/x86/yuv_2_rgb: fix some comments

libswscale/x86/yuv_2_rgb.asm

@@ -195,15 +195,15 @@ cglobal %1_420_%2%3, GPR_num, GPR_num, reg_num, parameters
     mova m5, m7
     paddsw m3, m0 ; B1 B3 B5 B7 ...
     paddsw m5, m1 ; R1 R3 R5 R7 ...
-    paddsw m7, m2 ; G1 G3 G4 G7 ...
+    paddsw m7, m2 ; G1 G3 G5 G7 ...
     paddsw m0, m6 ; B0 B2 B4 B6 ...
     paddsw m1, m6 ; R0 R2 R4 R6 ...
     paddsw m2, m6 ; G0 G2 G4 G6 ...
 
 %if %3 == 24 ; PACK RGB24
 %define depth 3
-    packuswb m0, m3 ; R0 R2 R4 R6 ... R1 R3 R5 R7 ...
-    packuswb m1, m5 ; B0 B2 B4 B6 ... B1 B3 B5 B7 ...
+    packuswb m0, m3 ; B0 B2 B4 B6 ... B1 B3 B5 B7 ...
+    packuswb m1, m5 ; R0 R2 R4 R6 ... R1 R3 R5 R7 ...
     packuswb m2, m7 ; G0 G2 G4 G6 ... G1 G3 G5 G7 ...
     mova m3, m_red
     mova m6, m_blue
@@ -248,7 +248,7 @@ cglobal %1_420_%2%3, GPR_num, GPR_num, reg_num, parameters
     psrlq m5, 32
     movd [imageq + 20], m2 ; -- -- G7 B7
     movd [imageq + 18], m5 ; R6 G6 B6 R7
-%endif ; mmsize = 8
+%endif ; cpuflag
 %else ; mmsize == 16
     pshufb m3, [rgb24_shuf1] ; r0  g0  r6  g6  r12 g12 r2  g2  r8  g8  r14 g14 r4  g4  r10 g10
     pshufb m6, [rgb24_shuf2] ; b10 r11 b0  r1  b6  r7  b12 r13 b2  r3  b8  r9  b14 r15 b4  r5