fix a typo that broke all screenshots

Bug: 8450197

Change-Id: I5b986cc0ff9c5e689d06a51ba68ab537d03d1f3d
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 2d84c54..8149a6e 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -110,7 +110,7 @@
     char value[PROPERTY_VALUE_MAX];
 
     property_get("ro.bq.gpu_to_cpu_unsupported", value, "0");
-    mGpuToCpuSupported = !!atoi(value);
+    mGpuToCpuSupported = !atoi(value);
 
     property_get("debug.sf.showupdates", value, "0");
     mDebugRegion = atoi(value);