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loopfiltersimpleverticaledge_neon: quiet uninit var warnings

the vector used in vld*_lane_* should be initialized before use

Change-Id: Idce95354737915f6fb4e6b5e8980a050e953036d

--- a/vp8/common/arm/neon/loopfiltersimpleverticaledge_neon.c

+++ b/vp8/common/arm/neon/loopfiltersimpleverticaledge_neon.c

@@ -153,6 +153,7 @@

 #else

 static INLINE

 uint8x8x4_t read_4x8(unsigned char *src, int pitch, uint8x8x4_t x) {

+    x.val[0] = x.val[1] = x.val[2] = x.val[3] = vdup_n_u8(0);

     x = vld4_lane_u8(src, x, 0);

     src += pitch;

     x = vld4_lane_u8(src, x, 1);