[Bug libc/21531] fclose with NULL is SEGV should set errno EFAULT or EBADF

[jg at jguk dot org]

https://sourceware.org/bugzilla/show_bug.cgi?id=21531

--- Comment #4 from Jon Grant <jg at jguk dot org> ---
Is there any harm checking for NULL ?
C11 introduced fopen_s which does check for NULL

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