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/CL/CLMultiHOG.h b/arm_compute/runtime/CL/CLMultiHOG.h
index 17bb4e0..b7d03bf 100644
--- a/arm_compute/runtime/CL/CLMultiHOG.h
+++ b/arm_compute/runtime/CL/CLMultiHOG.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017 ARM Limited.
+ * Copyright (c) 2017-2019 ARM Limited.
  *
  * SPDX-License-Identifier: MIT
  *
@@ -49,8 +49,8 @@
     const ICLHOG *cl_model(size_t index) const override;
 
 private:
-    size_t                   _num_models;
-    std::unique_ptr<CLHOG[]> _model;
+    size_t             _num_models;
+    std::vector<CLHOG> _model;
 };
 }
 #endif /*__ARM_COMPUTE_CLMULTIHOG_H__ */