config: bug: Fix SEGV in ast_category_insert when matching category isn't found

If you call ast_category_insert with a match category that doesn't exist, the
list traverse runs out of 'next' categories and you get a SEGV.  This patch
adds check for the end-of-list condition and changes the signature to return
an int for success/failure indication instead of a void.

The only consumer of this function is manager and it was also changed to use
the return value.

Tested by: George Joseph
Review: https://reviewboard.asterisk.org/r/3993/
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Merged revisions 423276 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 423277 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@423278 f38db490-d61c-443f-a65b-d21fe96a405b
res_pjsip: ami: Fix error in AMI output when an endpoint has no transport

When no transport is associated to an endpoint, the AMI output for
PJSIPShowEndpoint indicates an error instead of silently ignoring the
missing transport.

This patch causes the error to appear only if a transport was specified
on the endpoint and the transport doesn't exist.  It also fixes an issue
with counting the objects that were actually found.

ASTERISK-24161 #close
ASTERISK-24331 #close
Tested by: George Joseph
Review: https://reviewboard.asterisk.org/r/3998/


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/12@423282 f38db490-d61c-443f-a65b-d21fe96a405b