Fixed uninitialized memory error

platforms/cpu/src/CpuGBSAOBCForce.cpp

@@ -338,6 +338,11 @@ void CpuGBSAOBCForce::threadComputeForce(ThreadPool& threads, int threadIndex) {
             atomz[i] = posq[4*atomIndex+2];
             blockMask[i] = 0xFFFFFFFF;
         }
+        for (int i = numInBlock; i < 4; i++) {
+            atomx[i] = 0.0f;
+            atomy[i] = 0.0f;
+            atomz[i] = 0.0f;
+        }
         fvec4 offsetRadiusI(atomRadius);
         fvec4 x(atomx);
         fvec4 y(atomy);