Fixes for malloc / calloc + other fixes

This patch contains:

* checks for malloc return value + treat callers;
* modified malloc() + ZeroMemory() to calloc();
* misc fixes of micro errors seen during the code audit:
** some invalid checks in gcc.c, also there were some possible
integer overflow. This is interesting because at the end the data are parsed
and freed directly, so it's a vulnerability in some kind of dead code (at least
useless);
** fixed usage of GetComputerNameExA with just one call, when 2 were used
in misc places. According to MSDN GetComputerNameA() is supposed to return
an error when called with NULL;
** there were a bug in the command line parsing of shadow;
** in freerdp_dynamic_channel_collection_add() the size of array was multiplied
by 4 instead of 2 on resize

.gitignore

@@ -94,6 +94,7 @@ client/X11/xfreerdp
 client/Mac/xcode
 client/Sample/sfreerdp
 client/DirectFB/dfreerdp
+client/Wayland/wlfreerdp
 server/Sample/sfreerdp-server
 server/X11/xfreerdp-server
 xcode