Remove unnecessary code (#4141)

src/main/java/com/thealgorithms/conversions/OctalToDecimal.java

@@ -34,8 +34,7 @@ public class OctalToDecimal {
     public static int convertOctalToDecimal(String inputOctal) {
         try {
             // Actual conversion of Octal to Decimal:
-            Integer outputDecimal = Integer.parseInt(inputOctal, 8);
-            return outputDecimal;
+            return Integer.parseInt(inputOctal, 8);
         } catch (NumberFormatException ne) {
             // Printing a warning message if the input is not a valid octal
             // number: