realpath: Avoid overwriting preexisting error (CVE-2021-3998)
Set errno and failure for paths that are too long only if no other error occurred earlier. Related: BZ #28770 Reviewed-by:Andreas Schwab <schwab@linux-m68k.org> Signed-off-by:
Siddhesh Poyarekar <siddhesh@sourceware.org> (cherry picked from commit 84d2d0fe)
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