lib/vector/Vlib: Fix Resource Leak issue in copy.c

[ShubhamDesai]

This pull request addresses resource leak issue identified by coverity scan (CID : 1208071)
Used existing function Vect_destroy_field_info() to fix the memory leak issue.

[nilason]

There are a number of similar resource leak issues ¹ in that particular file, which are probably all trivial to fix. Please address them all in one (this) PR.

Footnotes

1. CID 1208069, 1208070, 1208072, 1208073, 1208074, 1208075, 1208076, 1208077, 1208078, 1208079, 1208080, 1208081, 1270330, 1415802 ↩

[ShubhamDesai]

There are a number of similar resource leak issues 1 in that particular file, which are probably all trivial to fix. Please address them all in one (this) PR.

Footnotes

1. CID 1208069, 1208070, 1208072, 1208073, 1208074, 1208075, 1208076, 1208077, 1208078, 1208079, 1208080, 1208081, 1270330, 1415802 ↩

I have done the changes.
I think 1208070 doesn't exit any more its fixed.

I am not sure whether my understanding about the other fixes related to resource leak is correct. Please point out my mistakes .

[ShubhamDesai]

@nilason i did the changes you suggested. Could you please review it. I am not sure whether i correctly interpreted your changes.

[nilason]

Great, thanks!