drm/amdgpu: Return boolean types instead of integer values

Return statements for functions returning bool should use truth
and false instead of 1 and 0 respectively.

Modify cik_event_interrupt.c to return false instead of 0.

Issue found with Coccinelle.
Signed-off-by: Sumera Priyadarsini <sylphrenadin@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -66,12 +66,12 @@ static bool cik_event_interrupt_isr(struct kfd_dev *dev,
 	vmid  = (ihre->ring_id & 0x0000ff00) >> 8;
 	if (vmid < dev->vm_info.first_vmid_kfd ||
 	    vmid > dev->vm_info.last_vmid_kfd)
-		return 0;
+		return false;
 
 	/* If there is no valid PASID, it's likely a firmware bug */
 	pasid = (ihre->ring_id & 0xffff0000) >> 16;
 	if (WARN_ONCE(pasid == 0, "FW bug: No PASID in KFD interrupt"))
-		return 0;
+		return false;
 
 	/* Interrupt types we care about: various signals and faults.
 	 * They will be forwarded to a work queue (see below).