drm/amdkfd: Return true/false (not 1/0) from bool functions

Return boolean values ("true" or "false") instead of 1 or 0 from bool
functions. This fixes the following warnings from coccicheck:

./drivers/gpu/drm/amd/amdkfd/kfd_int_process_v11.c:244:9-10: WARNING:
return of 0/1 in function 'event_interrupt_isr_v11' with return type
bool

Reported-by: Abaci Robot <[e-mail]>
Signed-off-by: Yang Li <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/amdkfd/kfd_int_process_v11.c

···
 	if (/*!KFD_IRQ_IS_FENCE(client_id, source_id) &&*/
 	    (vmid < dev->vm_info.first_vmid_kfd ||
 	    vmid > dev->vm_info.last_vmid_kfd))
-		return 0;
+		return false;
 
 	pasid = SOC15_PASID_FROM_IH_ENTRY(ih_ring_entry);
 	context_id0 = SOC15_CONTEXT_ID0_FROM_IH_ENTRY(ih_ring_entry);
 
 	if ((source_id == SOC15_INTSRC_CP_END_OF_PIPE) &&
 	    (context_id0 & AMDGPU_FENCE_MES_QUEUE_FLAG))
-		return 0;
+		return false;
 
 	pr_debug("client id 0x%x, source id %d, vmid %d, pasid 0x%x. raw data:\n",
 		 client_id, source_id, vmid, pasid);
···
 
 	/* If there is no valid PASID, it's likely a bug */
 	if (WARN_ONCE(pasid == 0, "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).