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Previously, passwordFromFile() returned NULL for valid cases (like no matching password found) and actual errors (two out-of-memory paths). This made it impossible for its sole caller, pqConnectOptions2(), to distinguish between these scenarios and fail the connection appropriately should an out-of-memory error occur. This patch extends passwordFromFile() to be able to detect both valid and failure cases, with an error string given back to the caller of the function. Out-of-memory failures unlikely happen in the field, so no backpatch is done. Author: Joshua Shanks <jjshanks@gmail.com> Discussion: https://postgr.es/m/CAOxqWDfihFRmhNVdfu8epYTXQRxkCHSOrg+=-ij2c_X3gW=o3g@mail.gmail.com