Fix two more places where wrong/invalid files can lead to file-handle leaks currently

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1737489 13f79535-47bb-0310-9956-ffa450edef68

src/ooxml/java/org/apache/poi/openxml4j/opc/OPCPackage.java

@@ -429,6 +429,7 @@ public abstract class OPCPackage implements RelationshipSource, Closeable {
 		if (this.contentTypeManager == null) {
 		    logger.log(POILogger.WARN,
 		            "Unable to call close() on a package that hasn't been fully opened yet");
+			revert();
 		    return;
 		}
 

src/ooxml/java/org/apache/poi/openxml4j/opc/internal/ZipHelper.java

@@ -247,8 +247,11 @@ public final class ZipHelper {
         
         // Peek at the first few bytes to sanity check
         FileInputStream input = new FileInputStream(file);
+        try {
             verifyZipHeader(input);
+        } finally {
             input.close();
+        }
 
         // Open as a proper zip file
         return new ZipSecureFile(file);