fix a memory leak in probe

Signed-off-by: Xiaolei Yu <dreifachstein@gmail.com>
Reviewed-by: Antoine Martin <antoine@nagafix.co.uk>
Tested-by: Antoine Martin <antoine@nagafix.co.uk>
Signed-off-by: Aaron Plattner <aplattner@nvidia.com>

src/dummy_driver.c

@@ -254,6 +254,9 @@ DUMMYProbe(DriverPtr drv, int flags)
 	    }
 	}
     }    
+
+    free(devSections);
+
     return foundScreen;
 }