Fix logic error: err != nil -> err == nil
Fix logic error: err != nil -> err == nil

jrick/btcwallet,synrg-labs/btcwallet,Roasbeef/btcwallet,btcsuite/btcwallet,jrick/dcrwallet,Roasbeef/btcwallet,jrick/dcrwallet,decred/dcrwallet,btcsuite/btcwallet,Stash-Crypto/btcwallet,Stash-Crypto/btcwallet,synrg-labs/btcwallet,decred/dcrwallet,jrick/btcwallet