add default feature to riscv

Author: romancardenas

riscv-rt/src/lib.rs

@@ -534,8 +534,6 @@ pub unsafe extern "C" fn start_trap_rust(trap_frame: *const TrapFrame) {
             }
         }
         xcause::Trap::Exception(_) => ExceptionHandler(&*trap_frame),
-            }
-        }
     }
 }
 

riscv/Cargo.toml

@@ -20,6 +20,7 @@ targets = [
 ]
 
 [features]
+default = ["riscv-pac/default"]
 s-mode = []
 critical-section-single-hart = ["critical-section/restore-state-bool"]