habanalabs/gaudi: fix warning: var might be used uninitialized

kernel test robot:
"warning: variable 'index' is used uninitialized whenever 'if' condition
is false"
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Koby Elbaz <kelbaz@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>

drivers/misc/habanalabs/gaudi/gaudi.c

@@ -7388,7 +7388,7 @@ static void gaudi_handle_qman_err(struct hl_device *hdev, u16 event_type, u64 *e
 		if (event_type == GAUDI_EVENT_MME0_QM) {
 			index = 0;
 			qid_base = GAUDI_QUEUE_ID_MME_0_0;
-		} else if (event_type == GAUDI_EVENT_MME2_QM) {
+		} else { /* event_type == GAUDI_EVENT_MME2_QM */
 			index = 2;
 			qid_base = GAUDI_QUEUE_ID_MME_1_0;
 		}