btrfs: drop redundant bflags initialization when allocating extent buffer
When allocating an extent buffer, at __alloc_extent_buffer(), there's no point in explicitly assigning zero to the bflags field of the new extent buffer because we allocated it with kmem_cache_zalloc(). So just remove the redundant initialization, it saves one mov instruction in the generated assembly code for x86_64 ("movq $0x0,0x10(%rax)"). Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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