webmdashenc: Fix memory leak

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

libavformat/webmdashenc.c

@@ -288,33 +288,55 @@ static int parse_filename(char *filename, char **representation_id,
     char *period_pos = NULL;
     char *temp_pos = NULL;
     char *filename_str = av_strdup(filename);
-    if (!filename_str) return AVERROR(ENOMEM);
+    int ret = 0;
+
+    if (!filename_str) {
+        ret = AVERROR(ENOMEM);
+        goto end;
+    }
     temp_pos = av_stristr(filename_str, "_");
     while (temp_pos) {
         underscore_pos = temp_pos + 1;
         temp_pos = av_stristr(temp_pos + 1, "_");
     }
-    if (!underscore_pos) return AVERROR_INVALIDDATA;
+    if (!underscore_pos) {
+        ret = AVERROR_INVALIDDATA;
+        goto end;
+    }
     period_pos = av_stristr(underscore_pos, ".");
-    if (!period_pos) return AVERROR_INVALIDDATA;
+    if (!period_pos) {
+        ret = AVERROR_INVALIDDATA;
+        goto end;
+    }
     *(underscore_pos - 1) = 0;
     if (representation_id) {
         *representation_id = av_malloc(period_pos - underscore_pos + 1);
-        if (!(*representation_id)) return AVERROR(ENOMEM);
+        if (!(*representation_id)) {
+            ret = AVERROR(ENOMEM);
+            goto end;
+        }
         av_strlcpy(*representation_id, underscore_pos, period_pos - underscore_pos + 1);
     }
     if (initialization_pattern) {
         *initialization_pattern = av_asprintf("%s_$RepresentationID$.hdr",
                                               filename_str);
-        if (!(*initialization_pattern)) return AVERROR(ENOMEM);
+        if (!(*initialization_pattern)) {
+            ret = AVERROR(ENOMEM);
+            goto end;
+        }
     }
     if (media_pattern) {
         *media_pattern = av_asprintf("%s_$RepresentationID$_$Number$.chk",
                                      filename_str);
-        if (!(*media_pattern)) return AVERROR(ENOMEM);
+        if (!(*media_pattern)) {
+            ret = AVERROR(ENOMEM);
+            goto end;
+        }
     }
-    av_free(filename_str);
-    return 0;
+
+end:
+    av_freep(&filename_str);
+    return ret;
 }
 
 /*