Handle faults during memory allocation#10
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fixes several situations that cause segmentation faults
Changes in 7253acd added malloc() tests and returns in case of errors. If something fails in list_insert_at() we must free the memory allocated for the new element (that was not inserted).
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fixes several situations that cause segmentation faults
Patch from LudovicRousseau/PCSC@a801c6e
Some changes are already included upstream (malloc() return value test).
This patch includes the remaining changes.