anv: Add missing error-checking to anv_block_pool_init (v2)

anv: Add missing error-checking to anv_block_pool_init (v2)

When the memfd_create() and u_vector_init() fail on anv_block_pool_init(),
this patch makes to return VK_ERROR_INITIALIZATION_FAILED.
All of initialization success on anv_block_pool_init(), it makes to return
VK_SUCCESS.

CID 1394319

v2: Fixes from Emil's review:
  a) Add the return type for propagating the return value to caller.
  b) Changed anv_block_pool_init() to return VK_ERROR_INITIALIZATION_FAILED
     on failure of initialization.

Cc: "13.0" <mesa-stable@lists.freedesktop.org>
Signed-off-by: Mun Gwan-gyeong <elongbug@gmail.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>