fix wrong exit call

riscv-bldc-forced-commutation/src/riscv-bldc.cpp

@@ -58,8 +58,8 @@ extern "C" void handle_m_ext_interrupt() {
     plic_source int_num  = PLIC_claim_interrupt(&g_plic);
     if ((int_num >=1 ) && (int_num < PLIC_NUM_INTERRUPTS))
       g_ext_interrupt_handlers[int_num]();
-    else
-      exit(1 + (uintptr_t) int_num);
+    //else
+    //  exit(1 + (uintptr_t) int_num);
     PLIC_complete_interrupt(&g_plic, int_num);
 }
 /*! \brief  mtime interval interrupt