dfu: cleanup

src/dfu.rs

@@ -2,10 +2,11 @@ use cortex_m_rt::{pre_init};
 
 const DFU_TRIG_MSG: u32 = 0xDECAFBAD;
 
-pub unsafe fn set_dfu_trigger() {
 extern "C" {
     static mut _dfu_msg: u32;
 }
+
+pub unsafe fn set_dfu_trigger() {
     _dfu_msg = DFU_TRIG_MSG;
 }
 
@@ -14,10 +15,6 @@ pub unsafe fn set_dfu_trigger() {
 /// bootloader expects MCU to be in reset state when called.
 #[pre_init]
 unsafe fn __pre_init() {
-    extern "C" {
-        static mut _dfu_msg: u32;
-    }
-
     if _dfu_msg == DFU_TRIG_MSG {
         _dfu_msg = 0x00000000;
 

src/main.rs

@@ -431,7 +431,7 @@ fn main() -> ! {
                                     unsafe {
                                         dfu::set_dfu_trigger();
                                     }
-                                    socket.close();
+                                    
                                     SCB::sys_reset();
                                 }
                             }