UBIFS: get rid of dbg_dump_stack

In case of errors we almost always need the stack dump - it makes no sense
to compile it out. Remove the 'dbg_dump_stack()' function completely.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

diff --cc fs/ubifs/debug.c
Simple merge

diff --cc fs/ubifs/debug.h
Simple merge

diff --cc fs/ubifs/io.c
Simple merge

diff --cc fs/ubifs/journal.c
Simple merge

diff --cc fs/ubifs/lprops.c
Simple merge

diff --cc fs/ubifs/lpt.c
Simple merge

diff --cc fs/ubifs/orphan.c
Simple merge

diff --cc fs/ubifs/tnc.c
Simple merge