FreeSWITCH

Fix misspelled function

switch_rtp_set_invalid_handler has been misspelled as
switch_rtp_set_invald_handler going all the way back to the
beginning.  So while it's possible that someone somewhere could be
relying on this misspelling, I think it's more likely that no one has
used it much and that's why it wasn't spotted.  We don't even use it
ourselves anywhere anymore.

Introduced in commit: 828e03715f67f358671c6691c3e9c0f2a66ec6ec