soft_reset: rm unreachable!

src/main.rs

@@ -95,7 +95,7 @@ fn panic(info: &core::panic::PanicInfo) -> ! {
     while !uart.tx_fifo_empty() {}
 
     slcr::RegisterBlock::unlocked(|slcr| slcr.soft_reset());
-    unreachable!()
+    loop {}
 }
 
 #[no_mangle]

src/slcr.rs

@@ -209,13 +209,11 @@ impl RegisterBlock {
     }
 
     /// Perform a soft reset
-    pub fn soft_reset(&mut self) -> ! {
+    pub fn soft_reset(&mut self) {
         self.pss_rst_ctrl.write(
             PssRstCtrl::zeroed()
                 .soft_rst(true)
         );
-
-        unreachable!()
     }
 }