Merge pull request #29351 from vipulnsward/unnecessary-assignment

Don't create extra assignment, just return

activesupport/lib/active_support/number_helper/rounding_helper.rb

@@ -40,11 +40,11 @@ def round_significant(number)
         def convert_to_decimal(number)
           case number
           when Float, String
-            number = BigDecimal(number.to_s)
+            BigDecimal(number.to_s)
           when Rational
-            number = BigDecimal(number, digit_count(number.to_i) + precision)
+            BigDecimal(number, digit_count(number.to_i) + precision)
           else
-            number = number.to_d
+            number.to_d
           end
         end