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Backends/SDL2/Controller: `!x` -> `x == 0`

Signed-off-by: Gabriel Ravier <gabravier@gmail.com>

--- a/src/Backends/SDL2/Controller.cpp

+++ b/src/Backends/SDL2/Controller.cpp

@@ -46,11 +46,11 @@

 	// Handle directional inputs

 	const Sint16 joystick_x = SDL_JoystickGetAxis(joystick, 0);

-	if (!joystick_x)

+	if (joystick_x == 0)

 		Backend_PrintError("Failed to get current state of X axis control on joystick: %s", SDL_GetError());

 	const Sint16 joystick_y = SDL_JoystickGetAxis(joystick, 1);

-	if (!joystick_y)

+	if (joystick_y == 0)

 		Backend_PrintError("Failed to get current state of Y axis control on joystick: %s", SDL_GetError());

 	status->bLeft = joystick_x < axis_neutrals[0] - DEADZONE;