Fix a typo and solve a crash. g_free() is not safe on uninitialized pointers.

merge of 'f4706af0f5b9c7f979da13640270f8ff4236235a'

Minor cleanup

We've already checked for the existance of the starttls node, so we know

Remove some stray spaces

Only call failure_cb if it exists for the [gs]et_public_alias functions.

jabber: Exclude ASCII 127 (Delete) from allowed SASLprep characters

jabber: Fix a crash when sending typing notifications to a malformed buddy

jabber: Fix a crash in the BoB code when receiving from Jabbim.

jabber: Don't use a static array when it might not be sufficient.

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