x86/crypto: Remove stray comment terminator

It seems the SPDX patch script managed to confuse itself.

Fixes: 2eb72d66

 ("treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_179.RULE")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>