libretrodb_tool wrong return value on no result

Description

I wrote a little shell-script to rename my gamefles to the actual title of the game. As crc32 returns the checkum in lowercase, as I started, the checksum was only matched when in uppercase, so search for both combining them with ||. This now results in doubled results in the var, and after jq I had filenames with newline in them.

Expected behavior

A return value not null should be returned if no matching entry was found and 0 should be returned when the query was succesfull.

Actual behavior

1 is returned, no matter if the query was succesfull or not.

Steps to reproduce the bug

1. ./libretrodb_tool Nintendo\ -\ Nintendo\ DS.rdb find "{'crc':b'3877d3d3'}"; echo $?
   Gives the game-data and 1, but on success it should be 0.
2. ./libretrodb_tool Nintendo\ -\ Nintendo\ DS.rdb find "{'crc':b'3877d3d2'}"; echo $?
   Gives just 1, which is correct.

Version/Commit

You can find this information under Information/System Information

• RetroArch: current master (bc43db178958d501700dbd2ee0c567c7649de316)

Start with the libretrodb_tool find command and reproduce both CRC queries from the issue, checking their printed output and shell exit status. Trace how a matching result and no-result case are reported, then verify that success returns 0 while no match returns a nonzero value.