takdec: fix initialisation of LOCAL_ALIGNED array

When LOCAL_ALIGNED uses manual alignment initialisation is not
possible.

Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/takdec.c

@@ -420,11 +420,13 @@ static void decode_filter_coeffs(TAKDecContext *s, int filter_order, int size,
 static int decode_subframe(TAKDecContext *s, int32_t *decoded,
                            int subframe_size, int prev_subframe_size)
 {
-    LOCAL_ALIGNED_16(int16_t, filter, [MAX_PREDICTORS]) = { 0, };
+    LOCAL_ALIGNED_16(int16_t, filter, [MAX_PREDICTORS]);
     GetBitContext *gb = &s->gb;
     int i, ret;
     int dshift, size, filter_quant, filter_order;
 
+    memset(filter, 0, MAX_PREDICTORS * sizeof(*filter));
+
     if (!get_bits1(gb))
         return decode_residues(s, decoded, subframe_size);