fast-import: Fix an gcc -Wuninitialized warning

Commit cbfd5e1c ("drop some obsolete "x = x" compiler warning hacks",
21-03-2013) removed a gcc hack that suppressed an "might be used
uninitialized" warning issued by older versions of gcc.

However, commit 3aa99df8 ('fast-import: clarify "inline" logic in
file_change_m', 21-03-2013) addresses an (almost) identical issue
(with very similar code), but includes additional code in it's
resolution. The solution used by this commit, unlike that used by
commit cbfd5e1c, also suppresses the -Wuninitialized warning on
older versions of gcc.

In order to suppress the warning (against the 'oe' symbol) in the
note_change_n() function, we adopt the same solution used by commit
3aa99df8.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
cat-file: Fix an gcc -Wuninitialized warning

After commit cbfd5e1c ("drop some obsolete "x = x" compiler warning
hacks", 21-03-2013) removed a gcc specific hack, older versions of
gcc now issue an "'contents' might be used uninitialized" warning.
In order to suppress the warning, we simply initialize the variable
to NULL in it's declaration.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'maint'

* maint:
  cat-file: Fix an gcc -Wuninitialized warning
  fast-import: Fix an gcc -Wuninitialized warning
Remove reference to very old Git version
Call it "Git User Manual"
Use correct asciidoc title level

Removes "Part I" while there is no "Part II"
Remove "Notes and todo" section
Fix typos and suboptimal wording
Improve clarifications and consistency in "Manipulating branches"
Use current "detached HEAD" message
Simplify "How to make a commit"
Improve description in "How to merge"
Simplify "Getting updates with git pull"
Remove obscure reference from "Examples"
Use "git merge" instead of "git pull ."
Use current output for "git repack"
"git prune" is safe nowadays; isn't it?
Remove irrelevant reference
Fix description in "Merge multiple trees"; remove unnecessary quoting
Remove unnecessary historical note