Merge branch 'trace' into 'master'

trace: Break on RBP OVERFLOW

See merge request redox-os/kernel!96

src/arch/x86_64/interrupt/trace.rs

@@ -30,6 +30,7 @@ pub unsafe fn stack_trace() {
             }
         } else {
             println!("  {:>016X}: RBP OVERFLOW", rbp);
+            break;
         }
     }
 }