rgw: add return value checking to avoid possible subsequent parse exception

[Yan-waller]

add return value checking to avoid possible subsequent parse exception

[theanalyst]

the first commit looks good.

I'm not very keen on the tab vs space change.. while I agree we should fix indentation, this does create problems when doing a git blame or when backporting commits... it is fine doing a ws change when you're kind of modifying the code around, lets see what others think of this?

[Yan-waller]

@theanalyst thanks for reminding me of the problems when doing a git blame or when backporting commits, that sounds reasonable. I droped that commit, and fix some necessary indents. Could you help to take a look again?

[theanalyst]

lgtm