checkpatch: improve missing blank line after declarations test

checkpatch: improve missing blank line after declarations test

A couple more modifications to the declarations tests.

o Declarations can also be bitfields so exclude things with a colon
o Make sure the current and previous lines are indented the same
  to avoid matching some macro where a struct type is passed on
  the previous line like:

		next = list_entry(buffer->entry.next,
				  struct binder_buffer, entry);
		if (buffer_start_page(next) == buffer_end_page(buffer))

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>