When the JBD code was forked to create the new JBD2 code base, the
references to CONFIG_JBD_DEBUG where never changed to
CONFIG_JBD2_DEBUG.  This patch fixes that.
Signed-off-by: NJose R. Santos <jrs@us.ibm.com>
Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>