Merge pull request ipfs/boxoipfs/interface-go-ipfs-core#57 from MichaelMure/fatal-on-err

test: fail early on err to avoid an unrelated panic This commit was moved from ipfs/interface-go-ipfs-core@d2f36edee6da64d7830304049ab8ec7058e8ffcb This commit was moved from ipfs/boxo@093084efa596dde65ed3e5515190cfdeb4a973e4