habanalabs/gaudi: set the correct rc in case of err

fix the following smatch warnings:
gaudi_internal_cb_pool_init() warn: missing error code 'rc'
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

@@ -8393,8 +8393,10 @@ static int gaudi_internal_cb_pool_init(struct hl_device *hdev,
 			HL_VA_RANGE_TYPE_HOST, HOST_SPACE_INTERNAL_CB_SZ,
 			HL_MMU_VA_ALIGNMENT_NOT_NEEDED);
 
-	if (!hdev->internal_cb_va_base)
+	if (!hdev->internal_cb_va_base) {
+		rc = -ENOMEM;
 		goto destroy_internal_cb_pool;
+	}
 
 	mutex_lock(&ctx->mmu_lock);
 	rc = hl_mmu_map_contiguous(ctx, hdev->internal_cb_va_base,