ext4: avoid bh leak in retry path of ext4_expand_extra_isize_ea()

commit dcb9917ba041866686fe152850364826c4622a36 upstream.

Change-Id: I689816d203f06f61ae30a4102ed6ccb623191e47
Reported-by: Dave Jones <davej@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>