minor fixes

src/com/bytezone/diskbrowser/cpm/CPMDisk.java

@@ -41,6 +41,7 @@ public class CPMDisk extends AbstractFormattedDisk
 
     setEmptyByte ((byte) 0xE5);
 
+    // search for the version string
     for (int i = 8; i >= 4; i -= 2)
     {
       byte[] buffer = disk.readSector (0, i);

src/com/bytezone/diskbrowser/disk/DiskFactory.java

@@ -49,7 +49,7 @@ public class DiskFactory
     Boolean compressed = false;
     Path originalPath = Paths.get (path);
 
-    if (suffix.equals ("gz"))
+    if ("gz".equals (suffix))
     {
       if (debug)
         System.out.println (" ** gzip **");
@@ -78,7 +78,7 @@ public class DiskFactory
         return null;
       }
     }
-    else if (suffix.equals ("zip"))
+    else if ("zip".equals (suffix))
     {
       if (debug)
         System.out.println (" ** zip **");