fx: add err

[alexanderchan-scality]

the missing err argument will cause S3 to crash as the logger will attempt to read the message property from an undefined.
fix: passes err to be returned in callback

[alexanderchan-scality]

@ironman-machine
DEFAULT_BRANCH=rel/7.4
SCALITY_FEDERATION_BRANCH=ft/GCP
SCALITY_INTEGRATION_BRANCH=ft/GCP
try

[ironman-machine]

Hello @alexanderchan-scality

"DEFAULT_BRANCH=rel/7.4": Success
"SCALITY_FEDERATION_BRANCH=ft/GCP": Success
"SCALITY_INTEGRATION_BRANCH=ft/GCP": Success
"try": Success: Try build successfully launched on 'http://ci.ironmann.io/gh/scality/Integration/20451' with the following env. args:

{
    "REPO_NAME": "S3",
    "DEFAULT_BRANCH": "rel/7.4",
    "SCALITY_INTEGRATION_BRANCH": "ft/GCP",
    "SCALITY_FEDERATION_BRANCH": "ft/GCP",
    "SCALITY_S3_BRANCH": "fx/gcp-add-err"
}

[ironman-machine]

💔 ☔ circleCI test failed.

[alexanderchan-scality]

@ironman-machine
DEFAULT_BRANCH=rel/7.4
SCALITY_FEDERATION_BRANCH=ft/GCP
SCALITY_INTEGRATION_BRANCH=ft/GCP
try

[ironman-machine]

Hello @alexanderchan-scality

"DEFAULT_BRANCH=rel/7.4": Success
"SCALITY_FEDERATION_BRANCH=ft/GCP": Success
"SCALITY_INTEGRATION_BRANCH=ft/GCP": Success
"try": Success: Try build successfully launched on 'http://ci.ironmann.io/gh/scality/Integration/20455' with the following env. args:

{
    "REPO_NAME": "S3",
    "DEFAULT_BRANCH": "rel/7.4",
    "SCALITY_INTEGRATION_BRANCH": "ft/GCP",
    "SCALITY_FEDERATION_BRANCH": "ft/GCP",
    "SCALITY_S3_BRANCH": "fx/gcp-add-err"
}

[ironman-machine]

☀️ 👍 circleCI test succeeded!