Should program exit, When close() failed for O_RDONLY mode

Hi,

 I find that most of the code does not check the return value of close(),  When open a file for reading(O_RDONLY).

 But I find that it checks the return value of close() in code "src/bin/pg_rewind/copy_fetch.c" When open a file for
reading(O_RDONLY).
 And it will call pg_fatal to cause premature exit.

 I think that when closing a read-only file fails, it shouid not exit  the program early.It  should ensure that the
programexecution is completed. 
 Like below:

・src/bin/pg_rewind/copy_fetch.c

before
--------------------------
rewind_copy_file_range
{
...
if (close(srcfd) != 0)
        pg_fatal("could not close file \"%s\": %m", srcpath); }
--------------------------

after
--------------------------
rewind_copy_file_range
{
...
    close(srcfd);
}
--------------------------

Regards,
--
Lin