aufs: possible bugfix, replace ->comm by get_task_comm()

It is not guaranteed that the string is unchanged while aufs refers to
it. get_task_comm() copies the string into local array.

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
aufs: possible bugfix, limit the access to ->comm

It is not guaranteed that the string is unchanged while aufs refers to
it. get_task_comm() may cost too high for producing a message. aufs
chose not to call it for printing, but protect it from the overrun.

Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
Merge branch 'aufs3.0/00base' into aufs3.0/01modular
Merge branch 'aufs3.0/01modular' into aufs3.0/30stdalone
Merge branch 'aufs3.0/00base' into aufs3.1/00base
Merge branch 'aufs3.0/01modular' into aufs3.1/01modular
Merge branch 'aufs3.1/00base' into aufs3.1/01modular
Merge branch 'aufs3.0/30stdalone' into aufs3.1/30stdalone
Merge branch 'aufs3.1/01modular' into aufs3.1/30stdalone
Merge branch 'aufs3.1/00base' into aufs3.2/00base
Merge branch 'aufs3.1/01modular' into aufs3.2/01modular
Merge branch 'aufs3.2/00base' into aufs3.2/01modular
Merge branch 'aufs3.1/30stdalone' into aufs3.2/30stdalone
Merge branch 'aufs3.2/01modular' into aufs3.2/30stdalone
Merge branch 'aufs3.2/00base' into aufs3.3/00base
Merge branch 'aufs3.2/01modular' into aufs3.3/01modular
Merge branch 'aufs3.3/00base' into aufs3.3/01modular
Merge branch 'aufs3.2/30stdalone' into aufs3.3/30stdalone
Merge branch 'aufs3.3/01modular' into aufs3.3/30stdalone
Merge branch 'aufs3.3/00base' into aufs3.4/00base