iwlwifi: mvm: warn about empty OTP

Signed-off-by: Eran Harary <eran.harary@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/nvm.c b/drivers/net/wireless/iwlwifi/mvm/nvm.c
index 1f1a550..b04805ccb4 100644
--- a/drivers/net/wireless/iwlwifi/mvm/nvm.c
+++ b/drivers/net/wireless/iwlwifi/mvm/nvm.c
@@ -530,6 +530,8 @@
 			}
 #endif
 		}
+		if (!size_read)
+			IWL_ERR(mvm, "OTP is blank\n");
 		kfree(nvm_buffer);
 	}