Move the no-space debugging logic into a separate function. Lets also
mark this branch as unlikely in binder_alloc_new_buf_locked() as most
requests will fit without issue.

Also add a few cosmetic changes and suggestions from checkpatch.
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20231201172212.1813387-14-cmllamas@google.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>