added qemu_mallocz()

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@665 c046a42c-6fe2-441c-8c8c-71466251a162

osdep.h

@@ -8,6 +8,7 @@ void qemu_vprintf(const char *fmt, va_list ap);
 void qemu_printf(const char *fmt, ...);
 
 void *qemu_malloc(size_t size);
+void *qemu_mallocz(size_t size);
 void qemu_free(void *ptr);
 
 void *get_mmap_addr(unsigned long size);