Remove some obsolete smgrcloseall() calls.

Before the advent of PROCSIGNAL_BARRIER_SMGRRELEASE, we didn't have a
comprehensive way to deal with Windows file handles that get in the way
of unlinking directories.  We had smgrcloseall() calls in a few places
to try to mitigate.

It's still a good idea for bgwriter and checkpointer to do that once per
checkpoint so they don't accumulate unbounded SMgrRelation objects, but
there is no longer any reason to close them at other random places such
as the error path, and the explanation as given in the comments is now
obsolete.

Author: Thomas Munro
Reviewed-by: Heikki Linnakangas, Robert Haas
Discussion: https://www.postgresql.org/message-id/CA%2BhUKGJ8NTvqLHz6dqbQnt2c8XCki4r2QvXjBQcXpVwxTY_pvA@mail.gmail.com

src/backend/postmaster/bgwriter.c

@@ -197,13 +197,6 @@ BackgroundWriterMain(void)
 		 */
 		pg_usleep(1000000L);
 
-		/*
-		 * Close all open files after any error.  This is helpful on Windows,
-		 * where holding deleted files open causes various strange errors.
-		 * It's not clear we need it elsewhere, but shouldn't hurt.
-		 */
-		smgrcloseall();
-
 		/* Report wait end here, when there is no further possibility of wait */
 		pgstat_report_wait_end();
 	}

src/backend/postmaster/checkpointer.c

@@ -301,13 +301,6 @@ CheckpointerMain(void)
 		 * fast as we can.
 		 */
 		pg_usleep(1000000L);
-
-		/*
-		 * Close all open files after any error.  This is helpful on Windows,
-		 * where holding deleted files open causes various strange errors.
-		 * It's not clear we need it elsewhere, but shouldn't hurt.
-		 */
-		smgrcloseall();
 	}
 
 	/* We can now handle ereport(ERROR) */

src/backend/postmaster/walwriter.c

@@ -186,13 +186,6 @@ WalWriterMain(void)
 		 * fast as we can.
 		 */
 		pg_usleep(1000000L);
-
-		/*
-		 * Close all open files after any error.  This is helpful on Windows,
-		 * where holding deleted files open causes various strange errors.
-		 * It's not clear we need it elsewhere, but shouldn't hurt.
-		 */
-		smgrcloseall();
 	}
 
 	/* We can now handle ereport(ERROR) */