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>

nochowderforyou/clams,thunderrabbit/clams,thunderrabbit/clams,thunderrabbit/clams,Jheguy2/Mercury,robvanmieghem/clams,Jheguy2/Mercury,Jheguy2/Mercury,robvanmieghem/clams,Jheguy2/Mercury,thunderrabbit/clams,robvanmieghem/clams,Kefkius/clams,dooglus/clams,dooglus/clams,Kefkius/clams,nochowderforyou/clams,dooglus/clams,Jheguy2/Mercury,robvanmieghem/clams,nochowderforyou/clams,thunderrabbit/clams,nochowderforyou/clams,Kefkius/clams,dooglus/clams,dooglus/clams,Kefkius/clams,Kefkius/clams,nochowderforyou/clams,robvanmieghem/clams