winspool: do not access NULL, when HeapAlloc failed

[Detlef Riekenberg]

Detected by Coverity:

It is possible, that we access NULL, when HeapAlloc failed and 
pm->monitor->pfnEnumPorts did not clear pm->returned


Changelog:
- winspool: Do not access NULL, when HeapAlloc failed



-- 
 
By by ... Detlef

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