Fixed minor code quality issues.

Author: dekobon

src/main/java/com/joyent/hadoop/fs/manta/MantaFileSystem.java

@@ -201,7 +201,7 @@ public URI getUri() {
     }
 
     @Override
-    public FSDataInputStream open(final Path path, final int i) throws IOException {
+    public FSDataInputStream open(final Path path, final int bufferSize) throws IOException {
         LOG.debug("Opening '{}' for reading.", path);
 
         final FileStatus fileStatus = getFileStatus(path);

src/main/java/com/joyent/hadoop/fs/manta/MantaSeekableInputStream.java

@@ -148,7 +148,7 @@ public boolean markSupported() {
     public synchronized int read(final long position, final byte[] buffer,
                                  final int offset, final int length) throws IOException {
         long oldPos = getPos();
-        int nread = -1;
+        int nread;
         try {
             seek(position);
             nread = read(buffer, offset, length);