Merge pull request #92 from UAVCAN/for_upstream_nuttx_changes_2

Do Not merge - This is needed to work with the latest upstream nuttx

libuavcan_drivers/stm32/driver/src/internal.hpp

@@ -109,12 +109,12 @@ struct CriticalSectionLocker
     const irqstate_t flags_;
 
     CriticalSectionLocker()
-        : flags_(irqsave())
+        : flags_(enter_critical_section())
     { }
 
     ~CriticalSectionLocker()
     {
-        irqrestore(flags_);
+        leave_critical_section(flags_);
     }
 };