avcodec: Read errno before av_log() as the callback from av_log() might affect errno

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/libxvid_rc.c

@@ -68,10 +68,11 @@ av_cold int ff_xvid_rate_control_init(MpegEncContext *s)
                  (rce->header_bits + rce->mv_bits + 7) / 8);
 
         if (write(fd, tmp, strlen(tmp)) < 0) {
+            int ret = AVERROR(errno);
             av_log(NULL, AV_LOG_ERROR, "Error %s writing 2pass logfile\n", strerror(errno));
             av_free(tmp_name);
             close(fd);
-            return AVERROR(errno);
+            return ret;
         }
     }
 

libavcodec/utils.c

@@ -1664,9 +1664,9 @@ int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *code
 #if CONFIG_ICONV
                     iconv_t cd = iconv_open("UTF-8", avctx->sub_charenc);
                     if (cd == (iconv_t)-1) {
+                        ret = AVERROR(errno);
                         av_log(avctx, AV_LOG_ERROR, "Unable to open iconv context "
                                "with input character encoding \"%s\"\n", avctx->sub_charenc);
-                        ret = AVERROR(errno);
                         goto free_and_end;
                     }
                     iconv_close(cd);
@@ -2649,10 +2649,10 @@ static int recode_subtitle(AVCodecContext *avctx,
     if (iconv(cd, &inb, &inl, &outb, &outl) == (size_t)-1 ||
         iconv(cd, NULL, NULL, &outb, &outl) == (size_t)-1 ||
         outl >= outpkt->size || inl != 0) {
+        ret = FFMIN(AVERROR(errno), -1);
         av_log(avctx, AV_LOG_ERROR, "Unable to recode subtitle event \"%s\" "
                "from %s to UTF-8\n", inpkt->data, avctx->sub_charenc);
         av_free_packet(&tmp);
-        ret = AVERROR(errno);
         goto end;
     }
     outpkt->size -= outl;