Clean up warning take 2

src/runtime/src/rtio_clocking.rs

@@ -454,7 +454,7 @@ fn set_fclk0_freq(clk: RtioClock, cfg: &Config) {
                 .modify(|_, w| w.divisor0(divisor0).divisor1(divisor1));
         });
     } else {
-        warn!("Could not set fclk0 for target frequency of '{:?}'", target_freq);
+        warn!("Could not set fclk0 for target frequency: '{:?}'", target_freq);
     }
 }