x86/events/amd/iommu: Remove redundant assignment to variable shift

Variable shift is being initialized with a value that is never read, it
is being re-assigned later inside a loop. The assignment is redundant
and can be removed.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211207185001.1412413-1-colin.i.king@gmail.com

arch/x86/events/amd/iommu.c

@@ -161,7 +161,7 @@ static int get_next_avail_iommu_bnk_cntr(struct perf_event *event)
 
 	raw_spin_lock_irqsave(&piommu->lock, flags);
 
-	for (bank = 0, shift = 0; bank < max_banks; bank++) {
+	for (bank = 0; bank < max_banks; bank++) {
 		for (cntr = 0; cntr < max_cntrs; cntr++) {
 			shift = bank + (bank*3) + cntr;
 			if (piommu->cntr_assign_mask & BIT_ULL(shift)) {