PVS-Studio warning V517 for Asterisk

static void channel_hangup_handler_cb(....)
{
  const char *event;
  ....
  if (!strcmp(action, "type")) {
    event = "HangupHandlerRun";
  } else if (!strcmp(action, "type")) {
    event = "HangupHandlerPop";
  } else if (!strcmp(action, "type")) {
    event = "HangupHandlerPush";
  } else {
    return;
  }
  ....
}

This suspicious code was found in Asterisk project by PVS-Studio static code analyzer.
Warning message is:
V517 The use of 'if (A) {...} else if (A) {...}' pattern was detected. There is a probability of logical error presence. Check lines: 851, 853. manager_channels.c 851

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/