Use single line code for getFileName

Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/main/java/com/owncloud/android/operations/UploadFileOperation.java

@@ -272,11 +272,7 @@ public class UploadFileOperation extends SyncOperation {
     }
 
     public String getFileName() {
-        if (mFile == null) {
-            return null;
-        }
-
-        return mFile.getFileName();
+        return (mFile != null) ? mFile.getFileName() : null;
     }
 
     public OCFile getFile() {