logger: fix memory leaks in backlog

ChangeLog.asciidoc

@@ -324,6 +324,7 @@ http://weechat.org/files/releasenotes/ReleaseNotes-devel.html[release notes]
 * irc: add option irc.look.notice_welcome_tags
 * irc: add server option "default_msg_kick" to customize default kick/kickban
   message (task #12777)
+* logger: fix memory leaks in backlog
 * logger: replace backslashs in name by logger replacement char under Cygwin
   (bug #41207)
 * lua: fix detection of Lua 5.2 in autotools (patch #8270)

src/plugins/logger/logger-tail.c

@@ -101,6 +101,8 @@ logger_tail_file (const char *filename, int n_lines)
         bytes_read = read (fd, buf, to_read);
         if (bytes_read <= 0)
         {
+            if (part_of_line)
+                free (part_of_line);
             logger_tail_free (ptr_line);
             close (fd);
             return NULL;
@@ -140,6 +142,7 @@ logger_tail_file (const char *filename, int n_lines)
                         if (!new_line->data)
                         {
                             free (part_of_line);
+                            free (new_line);
                             logger_tail_free (ptr_line);
                             close (fd);
                             return NULL;