Use pnode->nLastRecv as sync score directly
Use pnode->nLastRecv as sync score directly

NodeSyncScore() should find the node which we recv data most recently, so put a negative sign to pnode->nLastRecv is indeed wrong.

Also change the return value type to int64_t.

Signed-off-by: Huang Le <373bd4647e9675ad4bb4ffd8ee82e636c353434d@gmail.com>
Rebased-By: Wladimir J. van der Laan <bbc07dc96bb50bf6868a2ddfc4dae14fbed703d9@gmail.com>
Rebased-From: 09a54a6

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