avutil/pixelutils: correct the function name in comments

Signed-off-by: Jun Zhao <mypopydev@gmail.com>

libavutil/x86/pixelutils.asm

@@ -104,8 +104,8 @@ cglobal pixelutils_sad_16x16, 4,4,0, src1, stride1, src2, stride2
     RET
 
 ;-------------------------------------------------------------------------------
-; int ff_pixelutils_sad_16x16_sse(const uint8_t *src1, ptrdiff_t stride1,
-;                                 const uint8_t *src2, ptrdiff_t stride2);
+; int ff_pixelutils_sad_16x16_sse2(const uint8_t *src1, ptrdiff_t stride1,
+;                                  const uint8_t *src2, ptrdiff_t stride2);
 ;-------------------------------------------------------------------------------
 INIT_XMM sse2
 cglobal pixelutils_sad_16x16, 4,4,5, src1, stride1, src2, stride2
@@ -134,8 +134,8 @@ cglobal pixelutils_sad_16x16, 4,4,5, src1, stride1, src2, stride2
     RET
 
 ;-------------------------------------------------------------------------------
-; int ff_pixelutils_sad_[au]_16x16_sse(const uint8_t *src1, ptrdiff_t stride1,
-;                                      const uint8_t *src2, ptrdiff_t stride2);
+; int ff_pixelutils_sad_[au]_16x16_sse2(const uint8_t *src1, ptrdiff_t stride1,
+;                                       const uint8_t *src2, ptrdiff_t stride2);
 ;-------------------------------------------------------------------------------
 %macro SAD_XMM_16x16 1
 INIT_XMM sse2