Merge pull request #1659 from paopaofish/master

Remove redundant null check in VFSHolder

Author: harawata

src/main/java/org/apache/ibatis/io/VFS.java

@@ -58,7 +58,7 @@ static VFS createVFS() {
         Class<? extends VFS> impl = impls.get(i);
         try {
           vfs = impl.getDeclaredConstructor().newInstance();
-          if (vfs == null || !vfs.isValid()) {
+          if (!vfs.isValid()) {
             if (log.isDebugEnabled()) {
               log.debug("VFS implementation " + impl.getName() +
                   " is not valid in this environment.");