pidgin/pidgin

Fix a crash in the wincred providered when adding a password.

Something about the way the freeing works on Windows causes a segfault if we memset the memory to 0 first.

Testing Done:
Created a new account, stored the password, verified it was in the Credential Manager and that Pidgin didn't crash.

Reviewed at https://reviews.imfreedom.org/r/622/
#define PIDGIN_ICON 104
#define PIDGIN_TRAY_AVAILABLE_4BIT 105
#define PIDGIN_TRAY_AWAY_4BIT 106
#define PIDGIN_TRAY_BUSY_4BIT 107
#define PIDGIN_TRAY_XA_4BIT 108
#define PIDGIN_TRAY_OFFLINE_4BIT 109
#define PIDGIN_TRAY_CONNECTING_4BIT 110
#define PIDGIN_TRAY_PENDING_4BIT 111
#define PIDGIN_TRAY_INVISIBLE_4BIT 112