Consistently use tabs rather than spaces

Update code that has accidentally used spaces instead of tabs.
Also remove all trailing whitespace.

Issue: SPR-16968

spring-core/src/main/java/org/springframework/core/codec/CharSequenceEncoder.java

@@ -85,7 +85,7 @@ public final class CharSequenceEncoder extends AbstractEncoder<CharSequence> {
 			charset = mimeType.getCharset();
 		}
 		else {
-			 charset = DEFAULT_CHARSET;
+			charset = DEFAULT_CHARSET;
 		}
 		return charset;
 	}

spring-core/src/main/java/org/springframework/core/type/filter/AbstractTypeHierarchyTraversingFilter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -88,7 +88,7 @@ public abstract class AbstractTypeHierarchyTraversingFilter implements TypeFilte
 						logger.debug("Could not read super class [" + metadata.getSuperClassName() +
 								"] of type-filtered class [" + metadata.getClassName() + "]");
 					}
- 				}
+				}
 			}
 		}
 

spring-core/src/main/java/org/springframework/util/backoff/ExponentialBackOff.java

@@ -199,7 +199,7 @@ public class ExponentialBackOff implements BackOff {
 				return maxInterval;
 			}
 			else if (this.currentInterval < 0) {
-			 	long initialInterval = getInitialInterval();
+				long initialInterval = getInitialInterval();
 				this.currentInterval = (initialInterval < maxInterval
 						? initialInterval : maxInterval);
 			}