[Coverity CID :186062] Error handling issues in /samples/net/sockets/big_http_download/src/big_http_download.c

[mandarcthorat1]

Static code scan issues seen in File: /samples/net/sockets/big_http_download/src/big_http_download.c
Category: Error handling issues
Function: download
Component: Samples
CID: 186062
Please fix or provide comments to square it off in coverity in the link: https://scan9.coverity.com/reports.htm#v32951/p12996