avfilter/af_aiir: fix array length when selecting conjugate poles

diff --git a/libavfilter/af_aiir.c b/libavfilter/af_aiir.c
index ffe2606da68d6ff1002fb59faa4e73cdbf95f7c6..ac9558b8aa1e279c8c6dacb5e17e2f2df395f0d6 100644 (file)
--- a/libavfilter/af_aiir.c
+++ b/libavfilter/af_aiir.c
@@ -514,7 +514,7 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
                 }
             }
 
-            for (i = 0; i < iir->nb_ab[1]; i++) {
+            for (i = 0; i < iir->nb_ab[0]; i++) {
                 if (isnan(iir->ab[0][2 * i]) || isnan(iir->ab[0][2 * i + 1]))
                     continue;