AP_Scripting: Add a return around luaL_error

This is the normal method of calling luaL_error which longjmp's away,
and it helps the static analysis tools realize that anything afterwards
will not be reached

libraries/AP_Scripting/generator/src/main.c

@@ -1330,7 +1330,7 @@ void emit_userdata_method(const struct userdata *data, const struct method *meth
       // extract the userdata, it was a pointer, so we need to grab it
       fprintf(source, "    %s * ud = *check_%s(L, 1);\n", data->name, data->sanatized_name);
       fprintf(source, "    if (ud == NULL) {\n");
-      fprintf(source, "        luaL_error(L, \"Internal error, null pointer\");\n");
+      fprintf(source, "        return luaL_error(L, \"Internal error, null pointer\");\n");
       fprintf(source, "    }\n");
       break;
   }

libraries/AP_Scripting/lua_generated_bindings.cpp

@@ -2519,7 +2519,7 @@ static int AP_HAL__UARTDriver_set_flow_control(lua_State *L) {
     binding_argcheck(L, 2);
     AP_HAL::UARTDriver * ud = *check_AP_HAL__UARTDriver(L, 1);
     if (ud == NULL) {
-        luaL_error(L, "Internal error, null pointer");
+        return luaL_error(L, "Internal error, null pointer");
     }
     const lua_Integer raw_data_2 = luaL_checkinteger(L, 2);
     luaL_argcheck(L, ((raw_data_2 >= static_cast<int32_t>(AP_HAL::UARTDriver::FLOW_CONTROL_DISABLE)) && (raw_data_2 <= static_cast<int32_t>(AP_HAL::UARTDriver::FLOW_CONTROL_AUTO))), 2, "argument out of range");
@@ -2534,7 +2534,7 @@ static int AP_HAL__UARTDriver_available(lua_State *L) {
     binding_argcheck(L, 1);
     AP_HAL::UARTDriver * ud = *check_AP_HAL__UARTDriver(L, 1);
     if (ud == NULL) {
-        luaL_error(L, "Internal error, null pointer");
+        return luaL_error(L, "Internal error, null pointer");
     }
     const uint32_t data = ud->available();
 
@@ -2547,7 +2547,7 @@ static int AP_HAL__UARTDriver_write(lua_State *L) {
     binding_argcheck(L, 2);
     AP_HAL::UARTDriver * ud = *check_AP_HAL__UARTDriver(L, 1);
     if (ud == NULL) {
-        luaL_error(L, "Internal error, null pointer");
+        return luaL_error(L, "Internal error, null pointer");
     }
     const lua_Integer raw_data_2 = luaL_checkinteger(L, 2);
     luaL_argcheck(L, ((raw_data_2 >= MAX(0, 0)) && (raw_data_2 <= MIN(UINT8_MAX, UINT8_MAX))), 2, "argument out of range");
@@ -2564,7 +2564,7 @@ static int AP_HAL__UARTDriver_read(lua_State *L) {
     binding_argcheck(L, 1);
     AP_HAL::UARTDriver * ud = *check_AP_HAL__UARTDriver(L, 1);
     if (ud == NULL) {
-        luaL_error(L, "Internal error, null pointer");
+        return luaL_error(L, "Internal error, null pointer");
     }
     const int16_t data = ud->read();
 
@@ -2576,7 +2576,7 @@ static int AP_HAL__UARTDriver_begin(lua_State *L) {
     binding_argcheck(L, 2);
     AP_HAL::UARTDriver * ud = *check_AP_HAL__UARTDriver(L, 1);
     if (ud == NULL) {
-        luaL_error(L, "Internal error, null pointer");
+        return luaL_error(L, "Internal error, null pointer");
     }
     const uint32_t raw_data_2 = coerce_to_uint32_t(L, 2);
     luaL_argcheck(L, ((raw_data_2 >= MAX(1U, 0U)) && (raw_data_2 <= MIN(UINT32_MAX, UINT32_MAX))), 2, "argument out of range");