checkpatch can generate a false positive when inserting a new kernel-doc
block and function above an existing kernel-doc block.

Fix it by checking that the context line is also a newly inserted line.
Signed-off-by: NJoe Perches <joe@perches.com>
Reported-by: NDarren Hart <dvhart@linux.intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>