findbugs: remove unused parameters

src/main/java/com/owncloud/android/ui/activity/UploadFilesActivity.java

@@ -534,7 +534,7 @@ public class UploadFilesActivity extends FileActivity implements
                     File localFile = new File(localPath);
                     total += localFile.length();
                 }
-                return FileStorageUtils.getUsableSpace(mAccountOnCreation.name) >= total;
+                return FileStorageUtils.getUsableSpace() >= total;
             }
 
             return true;

src/main/java/com/owncloud/android/utils/FileStorageUtils.java

@@ -94,11 +94,10 @@ public class FileStorageUtils {
 
     /**
      * Optimistic number of bytes available on sd-card. accountName is ignored.
-     *
-     * @param accountName not used. can thus be null.
+     * 
      * @return Optimistic number of available bytes (can be less)
      */
-    public static long getUsableSpace(String accountName) {
+    public static long getUsableSpace() {
         File savePath = new File(MainApp.getStoragePath());
         return savePath.getUsableSpace();
     }