Fix valgrind error in Wiener Convolve

Memset uniniatilized memory in av1_wiener_convolve_add_src
modules.

BUG=aomedia:2125
BUG=aomedia:2127

Change-Id: Ifc7cf2b15d10f65597d03dfeec9b74422cf0cd53

av1/common/convolve.c

diff --git a/av1/common/convolve.c b/av1/common/convolve.c
index a36c17a..9c768bc 100644
--- a/av1/common/convolve.c
+++ b/av1/common/convolve.c
@@ -1132,6 +1132,7 @@
   uint16_t temp[WIENER_MAX_EXT_SIZE * MAX_SB_SIZE];
   const int intermediate_height =
       (((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS - 1;
+  memset(temp + (intermediate_height * MAX_SB_SIZE), 0, MAX_SB_SIZE);
 
   assert(w <= MAX_SB_SIZE);
   assert(h <= MAX_SB_SIZE);

av1/common/x86/wiener_convolve_avx2.c

diff --git a/av1/common/x86/wiener_convolve_avx2.c b/av1/common/x86/wiener_convolve_avx2.c
index ed7b9d3..87a6e12 100644
--- a/av1/common/x86/wiener_convolve_avx2.c
+++ b/av1/common/x86/wiener_convolve_avx2.c
@@ -40,6 +40,7 @@
   DECLARE_ALIGNED(32, uint16_t,
                   temp[(MAX_SB_SIZE + SUBPEL_TAPS - 1) * MAX_SB_SIZE]);
   int intermediate_height = h + SUBPEL_TAPS - 2;
+  memset(temp + (intermediate_height * MAX_SB_SIZE), 0, MAX_SB_SIZE);
   const int center_tap = ((SUBPEL_TAPS - 1) / 2);
   const uint8_t *const src_ptr = src - center_tap * src_stride - center_tap;
 

av1/common/x86/wiener_convolve_sse2.c

diff --git a/av1/common/x86/wiener_convolve_sse2.c b/av1/common/x86/wiener_convolve_sse2.c
index 7b2d24e..f9d00b7 100644
--- a/av1/common/x86/wiener_convolve_sse2.c
+++ b/av1/common/x86/wiener_convolve_sse2.c
@@ -33,6 +33,7 @@
   DECLARE_ALIGNED(16, uint16_t,
                   temp[(MAX_SB_SIZE + SUBPEL_TAPS - 1) * MAX_SB_SIZE]);
   int intermediate_height = h + SUBPEL_TAPS - 2;
+  memset(temp + (intermediate_height * MAX_SB_SIZE), 0, MAX_SB_SIZE);
   int i, j;
   const int center_tap = ((SUBPEL_TAPS - 1) / 2);
   const uint8_t *const src_ptr = src - center_tap * src_stride - center_tap;