[Varnish] #1175: -smalloc size limit failures does not increment the c_fail counter, but adds failed bytes to it

[Varnish]

#1175: -smalloc size limit failures does not increment the c_fail counter, but
adds failed bytes to it
----------------------+-------------------
 Reporter:  martin    |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:
Component:  varnishd  |    Version:  3.0.2
 Severity:  normal    |   Keywords:
----------------------+-------------------
 When -smalloc fails to allocate memory due to max size limit, it will add
 the number of bytes that failed to the c_fail counter for this storage
 backend.

 This is inconsistent with how -sfile works, and also how -smalloc behaves
 when the malloc() call fails. These other places all increment c_fail by
 one on errors.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1175>
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