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Backends/SDL2/Controller: `x` -> `x != NULL` and removed unnecessary braces

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

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

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

@@ -172,15 +172,11 @@

 				// Set up neutral axes

 				axis_neutrals = (Sint16*)malloc(sizeof(Sint16) * total_axes);

-				if (axis_neutrals)

-				{

+				if (axis_neutrals != NULL)

 					for (int i = 0; i < total_axes; ++i)

 						axis_neutrals[i] = SDL_JoystickGetAxis(joystick, i);

-				}

 				else

-				{

 					Backend_PrintError("Couldn't allocate memory for neutral axes");

-				}

 			}

 			else

 			{