fix two "No newline at end of file" warnings

src/dp_common.c

@@ -130,4 +130,4 @@ int dp_recv_new_msg_flags(nng_socket sock, nng_msg **msg_ptr, int flags)
     }
 
     return res;
-}
+}

src/dp_common_c_test.c

@@ -9,4 +9,4 @@ int main(int argc, char *argv[])
     for (int i=0; i<DP_DS_COUNT; ++i)
         log_info("doomstate_str: %d=%s", i, doomstate_str(i));
     return 0;
-}
+}