NSID: Fix build warning in nsid_testsuite.c

Add parentheses and update code format to fix build warning:
"suggest parentheses around '+' in operand of '&'".

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: Ic19125e6b8e98ffacfb83aac6b0589182665ac6d
1 file changed