Use glib for all allocations

- Removes need to check for malloc failure
- Removes need for NULL checks on free
- Adds checks for integer overflows
- Removes some extra memset calls
- Removes chance of mixing libc and glib malloc/free

src/common/servlist.h

@@ -45,7 +45,6 @@ typedef struct ircnet
 	char *real;
 	char *pass;
 	int logintype;
-	char *comment;
 	char *encoding;
 	GSList *servlist;
 	GSList *commandlist;