fix bilinear_interp build err on mali,test=develop (#3474)

mobile/src/operators/kernel/cl/cl_kernel/bilinear_interp_kernel.cl

@@ -13,7 +13,8 @@ See the License for the specific language governing permissions and
 limitations under the License. */
 
 #pragma OPENCL EXTENSION cl_khr_fp16 : enable
-__kernel void bilinear_interp(__read_only image2d_t input, __write_only image2d_t output,
+__kernel void bilinear_interp(
+    __read_only image2d_t input, __write_only image2d_t output,
     __private const float scale_h, __private const float scale_w,
     __private const int in_dims_h, __private const int out_dims_h,
     __private const int in_dims_w, __private const int out_dims_w,
@@ -45,10 +46,11 @@ __kernel void bilinear_interp(__read_only image2d_t input, __write_only image2d_
   }
   float wight0_w = center_w - floor_w;
   float wight0_h = center_h - floor_h;
-    float wight1_w = 1.0 - wight0_w;
-    float wight1_h = 1.0 - wight0_h;
+  float wight1_w = 1.0f - wight0_w;
+  float wight1_h = 1.0f - wight0_h;
 
-    const sampler_t sampler = CLK_NORMALIZED_COORDS_TRUE | CLK_ADDRESS_CLAMP | CLK_FILTER_NEAREST;
+  const sampler_t sampler =
+      CLK_NORMALIZED_COORDS_TRUE | CLK_ADDRESS_CLAMP | CLK_FILTER_NEAREST;
 
   // get left up pixel data
   int2 left_up;
@@ -75,8 +77,11 @@ __kernel void bilinear_interp(__read_only image2d_t input, __write_only image2d_
   half4 right_down_data = read_imageh(input, sampler, right_down);
 
   // calculate output data
-    half4 data = (left_down_data * wight1_w + right_down_data * wight0_w) * wight1_h
-            + (left_up_data * wight1_w + right_up_data * wight0_w) * wight0_h;
+  half4 data =
+      (left_down_data * (half)wight1_w + right_down_data * (half)wight0_w) *
+          (half)wight1_h +
+      (left_up_data * (half)wight1_w + right_up_data * (half)wight0_w) *
+          (half)wight0_h;
 
   write_imageh(output, output_pos, data);
 }
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