pg_restore: Provide file name with one failure message

Almost all error messages already include file name where relevant, but
this one had been overlooked.  Repair.

Backpatch to 9.5.

Author: Euler Taveira <euler.taveira@2ndquadrant.com>
Discussion: https://postgr.es/m/CAH503wA_VOrcKL_43p9atRejCDYmOZ8MzfK9S6TJrQqBqNeAXA@mail.gmail.com
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>

src/bin/pg_dump/pg_backup_directory.c

@@ -397,7 +397,7 @@ _PrintFileData(ArchiveHandle *AH, char *filename)
 
 	free(buf);
 	if (cfclose(cfp) !=0)
-		fatal("could not close data file: %m");
+		fatal("could not close data file \"%s\": %m", filename);
 }
 
 /*