x86/intel_rdt: Remove redundant ternary operator on return

The use of the ternary operator is redundant as ret can never be
non-zero at that point. Instead, just return nbytes.

Detected by CoverityScan, CID#1452658 ("Logically dead code")
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: kernel-janitors@vger.kernel.org
Link: http://lkml.kernel.org/r/20170808092859.13021-1-colin.king@canonical.com

arch/x86/kernel/cpu/intel_rdt_rdtgroup.c

@@ -680,7 +680,7 @@ static ssize_t max_threshold_occ_write(struct kernfs_open_file *of,
 
 	intel_cqm_threshold = bytes / r->mon_scale;
 
-	return ret ?: nbytes;
+	return nbytes;
 }
 
 /* rdtgroup information files for one cache resource. */