Replace all occurences of av_mallocz_array() by av_calloc()

They do the same.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

compat/w32dlfcn.h

@@ -42,7 +42,7 @@ static inline HMODULE win32_dlopen(const char *name)
         DWORD pathlen;
         if (utf8towchar(name, &name_w))
             goto exit;
-        path = (wchar_t *)av_mallocz_array(MAX_PATH, sizeof(wchar_t));
+        path = (wchar_t *)av_calloc(MAX_PATH, sizeof(wchar_t));
         // Try local directory first
         pathlen = GetModuleFileNameW(NULL, path, MAX_PATH);
         pathlen = wcsrchr(path, '\\') - path;