avformat/utils: simplify ff_alloc_extradata()

Cosmetic refactor

Reviewed-by: 74a2fa708af88d225ed708af758f236f869b1a57
Signed-off-by: James Almer <jamrial@gmail.com>

libavformat/utils.c

@@ -3243,24 +3243,20 @@ static int tb_unreliable(AVCodecContext *c)
 
 int ff_alloc_extradata(AVCodecParameters *par, int size)
 {
-    int ret;
-
     av_freep(&par->extradata);
-    if (size < 0 || size >= INT32_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
-        par->extradata = NULL;
-        par->extradata_size = 0;
+    par->extradata_size = 0;
+
+    if (size < 0 || size >= INT32_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
         return AVERROR(EINVAL);
-    }
+
     par->extradata = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
-    if (par->extradata) {
-        memset(par->extradata + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
-        par->extradata_size = size;
-        ret = 0;
-    } else {
-        par->extradata_size = 0;
-        ret = AVERROR(ENOMEM);
-    }
-    return ret;
+    if (!par->extradata)
+        return AVERROR(ENOMEM);
+
+    memset(par->extradata + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
+    par->extradata_size = size;
+
+    return 0;
 }
 
 int ff_get_extradata(AVFormatContext *s, AVCodecParameters *par, AVIOContext *pb, int size)