commit.c: rename variable named 'n' which masks previous declaration
commit.c: rename variable named 'n' which masks previous declaration

The variable named 'n' was initially declared to be of type int.  The name
'n' was reused inside inner blocks as a different type.  Rename the uses
within inner blocks to avoid confusion and give them a slightly more
descriptive name.

Signed-off-by: Brandon Casey <77bc9a9984e6786c5799d7a71768cf023120ef76@nrlssc.navy.mil>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git