updates after code review

Author: mmoayyed

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/context/MessageSourceAutoConfiguration.java

@@ -95,8 +95,8 @@ public MessageSource messageSource(MessageSourceProperties properties) {
 				messageSource.setCommonMessages(commonProperties);
 			}
 		}
-		catch (IOException e) {
-			throw new UncheckedIOException("Failed to load common messages", e);
+		catch (IOException ex) {
+			throw new UncheckedIOException("Failed to load common messages", ex);
 		}
 		return messageSource;
 	}