util: fix container_of on MSVC

otherwise &container_of(..)->foo won't work, need extra parens. gcc version is
fine.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@intel.com>
Reviewed-by: Yonggang Luo <luoyonggang@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38313>

src/util/macros.h

@@ -103,7 +103,7 @@
 #ifndef __GNUC__
    /* a grown-up compiler is required for the extra type checking: */
 #  define container_of(ptr, type, member)                               \
-      (type*)((uint8_t *)ptr - offsetof(type, member))
+      ((type*)((uint8_t *)ptr - offsetof(type, member)))
 #else
 #  define __same_type(a, b) \
       __builtin_types_compatible_p(__typeof__(a), __typeof__(b))