sim: m32r: fix missing break statement

The ftime syscall should not fallthrough to the sync syscall.
Clearly the code was missing a break statement.

sim/m32r/traps.c

@@ -407,6 +407,7 @@ m32r_trap (SIM_CPU *current_cpu, PCADDR pc, int num)
 		  errcode = EINVAL;
 		}
 	    }
+	    break;
 
 	  case TARGET_LINUX_SYS_sync:
 	    sync ();