avcodec/alacenc: Don't free unnecessarily

The init function of the ALAC encoder calls its own close function
if a call to ff_lpc_init() fails; yet nothing has been allocated before
that point (except extradata which is freed generically) and ff_lpc_init()
can be expected to clean up after itself on error (the documentation does
not say anything to the contrary and the current implementation can only
fail if the only allocation fails, so there is nothing to clean up on
error anyway), so this is unnecessary.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

libavcodec/alacenc.c

@@ -535,10 +535,8 @@ static av_cold int alac_encode_init(AVCodecContext *avctx)
                                                  avctx->bits_per_raw_sample);
 
     avctx->extradata = av_mallocz(ALAC_EXTRADATA_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
-    if (!avctx->extradata) {
-        ret = AVERROR(ENOMEM);
-        goto error;
-    }
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
     avctx->extradata_size = ALAC_EXTRADATA_SIZE;
 
     alac_extradata = avctx->extradata;
@@ -566,8 +564,7 @@ FF_DISABLE_DEPRECATION_WARNINGS
            avctx->min_prediction_order > ALAC_MAX_LPC_ORDER) {
             av_log(avctx, AV_LOG_ERROR, "invalid min prediction order: %d\n",
                    avctx->min_prediction_order);
-            ret = AVERROR(EINVAL);
-            goto error;
+            return AVERROR(EINVAL);
         }
 
         s->min_prediction_order = avctx->min_prediction_order;
@@ -578,8 +575,7 @@ FF_DISABLE_DEPRECATION_WARNINGS
             avctx->max_prediction_order > ALAC_MAX_LPC_ORDER) {
             av_log(avctx, AV_LOG_ERROR, "invalid max prediction order: %d\n",
                    avctx->max_prediction_order);
-            ret = AVERROR(EINVAL);
-            goto error;
+            return AVERROR(EINVAL);
         }
 
         s->max_prediction_order = avctx->max_prediction_order;
@@ -591,8 +587,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
         av_log(avctx, AV_LOG_ERROR,
                "invalid prediction orders: min=%d max=%d\n",
                s->min_prediction_order, s->max_prediction_order);
-        ret = AVERROR(EINVAL);
-        goto error;
+        return AVERROR(EINVAL);
     }
 
     s->avctx = avctx;
@@ -600,13 +595,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
     if ((ret = ff_lpc_init(&s->lpc_ctx, avctx->frame_size,
                            s->max_prediction_order,
                            FF_LPC_TYPE_LEVINSON)) < 0) {
-        goto error;
+        return ret;
     }
 
     return 0;
-error:
-    alac_encode_close(avctx);
-    return ret;
 }
 
 static int alac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,