fixup panic-itm too

Author: TDHolmes

panic-itm/CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+- changed `ITM::ptr()` to `ITM::PTR` as the `ptr()` functions are
+  deprecated (#386).
+
 ## [v0.4.2] - 2020-11-14
 
 - Support cortex-m v0.7.0

panic-itm/src/lib.rs

@@ -46,7 +46,7 @@ use cortex_m::peripheral::ITM;
 fn panic(info: &PanicInfo) -> ! {
     interrupt::disable();
 
-    let itm = unsafe { &mut *ITM::ptr() };
+    let itm = unsafe { &mut *ITM::PTR };
     let stim = &mut itm.stim[0];
 
     iprintln!(stim, "{}", info);