Remove dead code

This commit removes several lines of dead code.

Change-Id: Iaf03151ef3e66bcc29edcaeacf0096bab45d3b93
diff --git a/aom_dsp/arm/variance_neon.c b/aom_dsp/arm/variance_neon.c
index 82d1113..d4107ce 100644
--- a/aom_dsp/arm/variance_neon.c
+++ b/aom_dsp/arm/variance_neon.c
@@ -373,9 +373,7 @@
   d6u8 = vld1_u8(ref_ptr);
   ref_ptr += recon_stride;
   d3u8 = vld1_u8(src_ptr);
-  src_ptr += source_stride;
   d7u8 = vld1_u8(ref_ptr);
-  ref_ptr += recon_stride;
 
   q11u16 = vsubl_u8(d0u8, d4u8);
   q12u16 = vsubl_u8(d1u8, d5u8);
diff --git a/aom_dsp/mips/aom_convolve8_horiz_msa.c b/aom_dsp/mips/aom_convolve8_horiz_msa.c
index 363fad3..c8ab612 100644
--- a/aom_dsp/mips/aom_convolve8_horiz_msa.c
+++ b/aom_dsp/mips/aom_convolve8_horiz_msa.c
@@ -446,7 +446,6 @@
                 vec2, vec3);
     SRARI_H4_UH(vec0, vec1, vec2, vec3, FILTER_BITS);
     LD_SB4(src, src_stride, src0, src1, src2, src3);
-    src += (4 * src_stride);
 
     PCKEV_B2_SB(vec1, vec0, vec3, vec2, out0, out1);
     ST8x4_UB(out0, out1, dst, dst_stride);
diff --git a/aom_dsp/mips/aom_convolve8_vert_msa.c b/aom_dsp/mips/aom_convolve8_vert_msa.c
index aa962b4..2c3bc08 100644
--- a/aom_dsp/mips/aom_convolve8_vert_msa.c
+++ b/aom_dsp/mips/aom_convolve8_vert_msa.c
@@ -313,7 +313,6 @@
   filt0 = (v16u8)__msa_splati_h(filt, 0);
 
   LD_SB5(src, src_stride, src0, src1, src2, src3, src4);
-  src += (5 * src_stride);
 
   ILVR_B4_SB(src1, src0, src2, src1, src3, src2, src4, src3, src10_r, src21_r,
              src32_r, src43_r);
@@ -341,7 +340,6 @@
   src += (8 * src_stride);
 
   src8 = LD_SB(src);
-  src += src_stride;
 
   ILVR_B4_SB(src1, src0, src2, src1, src3, src2, src4, src3, src10_r, src21_r,
              src32_r, src43_r);