drm/amdkfd: remove redundant variables err and ret

Return value from kfd_wait_on_events() and io_remap_pfn_range() directly
instead of taking this in another redundant variable.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Jinpeng Cui <cui.jinpeng2@zte.com.cn>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_chardev.c

@@ -876,14 +876,11 @@ static int kfd_ioctl_wait_events(struct file *filp, struct kfd_process *p,
 				void *data)
 {
 	struct kfd_ioctl_wait_events_args *args = data;
-	int err;
 
-	err = kfd_wait_on_events(p, args->num_events,
+	return kfd_wait_on_events(p, args->num_events,
 			(void __user *)args->events_ptr,
 			(args->wait_for_all != 0),
 			&args->timeout, &args->wait_result);
-
-	return err;
 }
 static int kfd_ioctl_set_scratch_backing_va(struct file *filep,
 					struct kfd_process *p, void *data)
@@ -2860,7 +2857,6 @@ static int kfd_mmio_mmap(struct kfd_dev *dev, struct kfd_process *process,
 		      struct vm_area_struct *vma)
 {
 	phys_addr_t address;
-	int ret;
 
 	if (vma->vm_end - vma->vm_start != PAGE_SIZE)
 		return -EINVAL;
@@ -2880,12 +2876,11 @@ static int kfd_mmio_mmap(struct kfd_dev *dev, struct kfd_process *process,
 		 process->pasid, (unsigned long long) vma->vm_start,
 		 address, vma->vm_flags, PAGE_SIZE);
 
-	ret = io_remap_pfn_range(vma,
+	return io_remap_pfn_range(vma,
 				vma->vm_start,
 				address >> PAGE_SHIFT,
 				PAGE_SIZE,
 				vma->vm_page_prot);
-	return ret;
 }