Fix minor warnings

ScriptableRenderPipeline/Core/CoreRP/Shadow/Shadow.cs

                     }
 
                     // read
-                    float texelSizeX = 1.0f, texelSizeY = 1.0f;
                     CachedEntry ce = m_EntryCache[ceIdx];
                     ce.zclip = sr.shadowType != GPUShadowType.Directional;
 
                         if( ce.current.splitData.cullingSphere.w != float.NegativeInfinity )
                         {
                             int face = (int)key.faceIdx;
-                            texelSizeX = 2.0f / ce.current.proj.m00;
-                            texelSizeY = 2.0f / ce.current.proj.m11;
                             m_TmpBorders[face] = cascadeBorders[face];
                             m_TmpSplits[key.faceIdx].w *= ce.current.splitData.cullingSphere.w;
                         }

ScriptableRenderPipeline/LightweightPipeline/LWRP/Data/LightweightPipelineAsset.cs

     {
         private const int PACKAGE_MANAGER_PATH_INDEX = 1;
         private Shader m_DefaultShader;
-        public static readonly string[] m_SearchPaths = {"Assets", "Packages/com.unity.render-pipelines.lightweight"};
+        public static readonly string m_SearchPathProject = "Assets";
+        public static readonly string m_SearchPathPackage = "Packages/com.unity.render-pipelines.lightweight";
 
         // Default values set when a new LightweightPipeline asset is created
         [SerializeField] private int kAssetVersion = 2;
         private static T LoadResourceFile<T>() where T : ScriptableObject
         {
             T resourceAsset = null;
-            var guids = AssetDatabase.FindAssets(typeof(T).Name + " t:scriptableobject", m_SearchPaths);
+            var guids = AssetDatabase.FindAssets(typeof(T).Name + " t:scriptableobject", new []{m_SearchPathProject});
             foreach (string guid in guids)
             {
                 string path = AssetDatabase.GUIDToAssetPath(guid);
             // There's currently an issue that prevents FindAssets from find resources withing the package folder.
             if (resourceAsset == null)
             {
-                string path = m_SearchPaths[PACKAGE_MANAGER_PATH_INDEX] + "/LWRP/Data/" + typeof(T).Name + ".asset";
+                string path = m_SearchPathPackage + "/LWRP/Data/" + typeof(T).Name + ".asset";
                 resourceAsset = AssetDatabase.LoadAssetAtPath<T>(path);
             }
             return resourceAsset;

ScriptableRenderPipeline/LightweightPipeline/LWRP/ShaderLibrary/LightweightPassMeta.hlsl

         unity_OneOverOutputBoost = saturate(unity_OneOverOutputBoost);
 
         // Apply Albedo Boost from LightmapSettings.
-        res.rgb = clamp(pow(res.rgb, unity_OneOverOutputBoost), 0, unity_MaxOutputValue);
+        res.rgb = clamp(PositivePow(res.rgb, unity_OneOverOutputBoost), 0, unity_MaxOutputValue);
     }
     if (unity_MetaFragmentControl.y)
     {