[sr-dev] [kamailio/kamailio] ims_isc: initial fix of issue #1168 (#1553)

[Christoph VALENTIN]

Function isc_match_filter() got a new local variable firstflag in
order to handle the case where a FAILURE_ROUTE callback is
received before the first AS has been contacted.
The firstflag is also forwarded to function isc_forward() as
parameter.

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#### Type Of Change
- [x] Small bug fix (non-breaking change which fixes an issue)
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#### Checklist:
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#### Description
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This is the 5.1 pull request, which was created by cherry-pick from the master pull request
You can view, comment on, or merge this pull request online at:

  https://github.com/kamailio/kamailio/pull/1553

-- Commit Summary --

  * ims_isc: initial fix of issue #1168

-- File Changes --

    M src/modules/ims_isc/ims_isc_mod.c (9)
    M src/modules/ims_isc/isc.c (4)
    M src/modules/ims_isc/isc.h (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/1553.patch
https://github.com/kamailio/kamailio/pull/1553.diff

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