Ye-old pgindent run. Same 4-space tabs.

contrib/array/array_iterator.c

contrib/array/array_iterator.h

contrib/bit/varbit.c

contrib/bit/varbit.h

contrib/bit/varbit_glue.c

contrib/bit/vartest.c

contrib/datetime/datetime_functions.c

contrib/datetime/datetime_functions.h

contrib/miscutil/misc_utils.c

contrib/miscutil/misc_utils.h

contrib/os2client/config.h

contrib/pgbench/pgbench.c

contrib/string/string_io.c

contrib/string/string_io.h

contrib/userlock/user_locks.c

contrib/userlock/user_locks.h

src/backend/access/common/heaptuple.c

src/backend/access/common/indextuple.c

src/backend/access/common/tupdesc.c

src/backend/access/gist/gist.c