moved data rate check in enable branch of set cmm

src/lib.rs

@@ -290,11 +290,10 @@ where
     }
 
     pub async fn set_continuous_mode(&mut self, enable: bool) -> Result<(), Error<I::Error>> {
-        if matches!(self.data_rate, DataRate::Unset) {
-            return Err(Error::NoDataRateSet);
-        }
-
         if enable {
+            if matches!(self.data_rate, DataRate::Unset) {
+                return Err(Error::NoDataRateSet);
+            }
             self.write_reg_controll_0(self.ctrl0 | Control0RegisterFlags::CMM_FRE_EN)
                 .await?;