fs/ntfs3: Fix wrong cast in xattr.c

cpu_to_be32 and be32_to_cpu respectively return and receive
__be32, change the cast to the correct types.

Fixes the following sparse warnings:
fs/ntfs3/xattr.c:811:48: sparse: sparse: incorrect type in
                         assignment (different base types)
fs/ntfs3/xattr.c:901:34: sparse: sparse: cast to restricted __be32
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Daniel Pinto <danielpinto52@gmail.com>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

fs/ntfs3/xattr.c

@@ -780,7 +780,7 @@ static int ntfs_getxattr(const struct xattr_handler *handler, struct dentry *de,
 			err = sizeof(u32);
 			*(u32 *)buffer = le32_to_cpu(ni->std_fa);
 			if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
-				*(u32 *)buffer = cpu_to_be32(*(u32 *)buffer);
+				*(__be32 *)buffer = cpu_to_be32(*(u32 *)buffer);
 		}
 		goto out;
 	}
@@ -857,7 +857,7 @@ static noinline int ntfs_setxattr(const struct xattr_handler *handler,
 		if (size != sizeof(u32))
 			goto out;
 		if (!strcmp(name, SYSTEM_NTFS_ATTRIB_BE))
-			new_fa = cpu_to_le32(be32_to_cpu(*(u32 *)value));
+			new_fa = cpu_to_le32(be32_to_cpu(*(__be32 *)value));
 		else
 			new_fa = cpu_to_le32(*(u32 *)value);