FTP: Avoid ServerSocket leak and cleanup unnecessary code.

Assigning serverSocket to NULL when IOException occurs on
connection socket is not required. Also without a proper
closure for RFCOMMServerSocket before assigning it to NULL
would cause a socket leak.

Change-Id: I99dfcd03f5f73b30fe1763cffcb2a00baed93286
CRs-fixed: 715033
1 file changed