touch: "setting times of" instead of "cannot touch" for an existing file the user cannot write #15021

# f is root:root, mode 644; run as nobody
$ touch f
touch: setting times of 'f': Permission denied

GNU 9.12 (built from source) prints touch: cannot touch 'f': Permission denied. uutils uses "cannot touch" only when it fails to create a missing file; for an existing file any failure is reported as "setting times of".

uutils main at 2b85f6f, Linux.