[patch] s390/smp: clean up a condition

[Dan Carpenter]

I can never remember precedence rules.  Let's add some parenthesis so
this code is more clear.

Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
---
The original code is correct right?  We didn't intend to say:

        sclp_max = sclp.max_cores * (sclp_max ?: nr_cpu_ids);

diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 5c8f7ca..35531fe 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -887,7 +887,7 @@ void __init smp_fill_possible_mask(void)
 
        sclp_max = max(sclp.mtid, sclp.mtid_cp) + 1;
        sclp_max = min(smp_max_threads, sclp_max);
-       sclp_max = sclp.max_cores * sclp_max ?: nr_cpu_ids;
+       sclp_max = (sclp.max_cores * sclp_max) ?: nr_cpu_ids;
        possible = setup_possible_cpus ?: nr_cpu_ids;
        possible = min(possible, sclp_max);
        for (cpu = 0; cpu < possible && cpu < nr_cpu_ids; cpu++)