copy-firmware.sh: remove no longer reachable test -f

With previous commit we call check_whence.py, which ensures that all files
listed are available. Drop the now dead code.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

copy-firmware.sh

@@ -76,7 +76,6 @@ $verbose "Checking that WHENCE file is formatted properly"
 
 # shellcheck disable=SC2162 # file/folder name can include escaped symbols
 grep -E '^(RawFile|File):' WHENCE | sed -E -e 's/^(RawFile|File): */\1 /;s/"//g' | while read k f; do
-    test -f "$f" || continue
     install -d "$destdir/$(dirname "$f")"
     $verbose "copying/compressing file $f$compext"
     if test "$compress" != "cat" && test "$k" = "RawFile"; then