selftests/x86/ldt_gdt: remove unneeded semicolon

Eliminate the following coccicheck warning:
./tools/testing/selftests/x86/ldt_gdt.c:610:2-3: Unneeded semicolon
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

tools/testing/selftests/x86/ldt_gdt.c

@@ -607,7 +607,7 @@ static void do_multicpu_tests(void)
 
 		failures++;
 		asm volatile ("mov %0, %%ss" : : "rm" (orig_ss));
-	};
+	}
 
 	ftx = 100;  /* Kill the thread. */
 	syscall(SYS_futex, &ftx, FUTEX_WAKE, 0, NULL, NULL, 0);