api: oci image pull: unconditionally unlink temporary file on interrupt

It's more robust and cheaper to just always unlink (always one
syscall) and ignore ENOENT compared to stat and optional unlink (two
syscalls worst case).

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/PVE/API2/Storage/Status.pm

@@ -977,8 +977,8 @@ __PACKAGE__->register_method({
 
         local $SIG{INT} = sub {
             unlink "$path/$tmp_filename"
-                or warn "could not cleanup temporary file: $!"
-                if -e "$path/$tmp_filename";
+                or $!{ENOENT}
+                or warn "could not cleanup temporary file: $!";
             die "got interrupted by signal\n";
         };