fix noise issue for neon function
There is typo in the code, which cause noise when neon is used.
diff --git a/spa/plugins/audioconvert/fmt-ops-neon.c b/spa/plugins/audioconvert/fmt-ops-neon.c
index 0006456fc..55be55fa5 100644
--- a/spa/plugins/audioconvert/fmt-ops-neon.c
+++ b/spa/plugins/audioconvert/fmt-ops-neon.c
@@ -294,7 +294,7 @@ conv_f32d_to_s16_2s_neon(void *data, void * SPA_RESTRICT dst, const void * SPA_R
" beq 4f\n"
"3:"
" ld1 { v0.s }[0], [%[s0]], #4\n"
- " ld1 { v2.s }[0], [%[s1]], #4\n"
+ " ld1 { v1.s }[0], [%[s1]], #4\n"
" subs %[remainder], %[remainder], #1\n"
" sqadd v0.4s, v0.4s, v2.4s\n"
" sqadd v1.4s, v1.4s, v2.4s\n"