Ruby style changes: replace `== 0` with `zero?`
diff --git a/src/ruby/lib/grpc/core/time_consts.rb b/src/ruby/lib/grpc/core/time_consts.rb
index 7750cb0..e6dae7b 100644
--- a/src/ruby/lib/grpc/core/time_consts.rb
+++ b/src/ruby/lib/grpc/core/time_consts.rb
@@ -58,7 +58,7 @@
                "Cannot make an absolute deadline from #{timeish.inspect}")
         elsif timeish < 0
           TimeConsts::INFINITE_FUTURE
-        elsif timeish == 0
+        elsif timeish.zero?
           TimeConsts::ZERO
         else
           Time.now + timeish