ghttp: Prevent use of uninitialized variable.

If cs_malloc() fails 'existing' variable is left uninitialized.

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@8726 4b0bc96b-bc66-0410-9d44-ebda105a78c1
ghttp: Prevent warnings about shadowed variables.

This fixes:
> module-ghttp.c: In function '_ssl_connect':
> module-ghttp.c:38: warning: declaration of 'socket' shadows a global declaration
> /usr/include/sys/socket.h:615: warning: shadowed declaration is here
> module-ghttp.c: In function '_is_post_context':
> module-ghttp.c:205: warning: declaration of 'remove' shadows a global declaration
> /usr/include/stdio.h:285: warning: shadowed declaration is here

git-svn-id: http://streamboard.de.vu/svn/oscam/trunk@8727 4b0bc96b-bc66-0410-9d44-ebda105a78c1