scripts/spdxcheck.py: fix C++ comment style detection

With the last commit to support the SuperH boot code files, we have the
following regression:

$ ./scripts/checkpatch.pl -f <(echo '/* SPDX-License-Identifier: MIT */')
WARNING: 'SPDX-License-Identifier: MIT */' is not supported in LICENSES/..
+/* SPDX-License-Identifier: MIT */

total: 0 errors, 1 warnings, 1 lines checked

NOTE: For some of the reported defects, checkpatch may be able to
mechanically convert to the typical style using --fix or --fix-inplace.

/dev/fd/63 has style problems, please review.

NOTE: If any of the errors are false positives, please report
them to the maintainer, see CHECKPATCH in MAINTAINERS.

This is not obvious, but spdxcheck.py is launched in checkpatch.pl with :
...
} elsif ($rawline =~ /(SPDX-License-Identifier: .*)/) {
my $spdx_license = $1;
if (!is_SPDX_License_valid($spdx_license)) {
WARN("SPDX_LICENSE_TAG",
"'$spdx_license' is not supported in LICENSES/...\n" . \
$herecurr);
}
...
sub is_SPDX_License_valid {
my ($license) = @_;
...
my $status = `cd "$root_path"; echo "$license" |
python scripts/spdxcheck.py -`;
...
}

The first chars before 'SPDX-License-Identifier:' are ignored.
This commit fixes this regression.

Fixes:959b49687838 (scripts/spdxcheck.py: Handle special quotation mark comments)
Signed-off-by:Aurélien Cedeyn <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>

scripts/spdxcheck.py

···
                     continue
                 expr = line.split(':')[1].strip()
                 # Remove trailing comment closure
-                if line.startswith('/*'):
+                if line.strip().endswith('*/'):
                     expr = expr.rstrip('*/').strip()
                 # Special case for SH magic boot code files
                 if line.startswith('LIST \"'):