COMPMID-2177 Fix clang warnings

Change-Id: I78039db8c58d7b14a042c41e54c25fb9cb509bf7
Signed-off-by: Michalis Spyrou <michalis.spyrou@arm.com>
Reviewed-on: https://review.mlplatform.org/c/1092
Reviewed-by: VidhyaSudhan Loganathan <vidhyasudhan.loganathan@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/arm_compute/runtime/NEON/functions/NEUnstack.h b/arm_compute/runtime/NEON/functions/NEUnstack.h
index 7210afa..4fd4a35 100644
--- a/arm_compute/runtime/NEON/functions/NEUnstack.h
+++ b/arm_compute/runtime/NEON/functions/NEUnstack.h
@@ -68,8 +68,8 @@
     void run() override;
 
 private:
-    unsigned int                      _num_slices;
-    std::unique_ptr<NEStridedSlice[]> _strided_slice_vector;
+    unsigned int                _num_slices;
+    std::vector<NEStridedSlice> _strided_slice_vector;
 };
 } // namespace arm_compute
 #endif /* __ARM_COMPUTE_NEUNSTACK_H__ */