pgsql: Fix some issues in pg_rewind.

Fix some issues in pg_rewind.

* Remove invalid option character "N" from the third argument (valid option
string) of getopt_long().

* Use pg_free() or pfree() to free the memory allocated by pg_malloc() or
palloc() instead of always using free().

* Assume problem is no disk space if write() fails but doesn't set errno.

* Fix several typos.

Patch by me. Review by Michael Paquier.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/966c37fdb5ed9b87f3e91eace4dbbed7909f6769

Modified Files
--------------
src/bin/pg_rewind/copy_fetch.c | 4 ++--
src/bin/pg_rewind/datapagemap.c | 4 ++--
src/bin/pg_rewind/file_ops.c | 6 ++++++
src/bin/pg_rewind/filemap.c | 8 ++++----
src/bin/pg_rewind/libpq_fetch.c | 4 ++--
src/bin/pg_rewind/logging.h | 2 +-
src/bin/pg_rewind/pg_rewind.c | 6 +++---
7 files changed, 20 insertions(+), 14 deletions(-)