COMPMID-418 Add check and fix comments after preprocessor conditions

Change-Id: I1353fd652ee180e3931e58b4ce13d651a48c7e2c
Reviewed-on: http://mpd-gerrit.cambridge.arm.com/79567
Tested-by: Kaizen <jeremy.johnson+kaizengerrit@arm.com>
Reviewed-by: Moritz Pflanzer <moritz.pflanzer@arm.com>
diff --git a/src/core/CL/cl_kernels/convolution3x3.cl b/src/core/CL/cl_kernels/convolution3x3.cl
index 3733d0c..8c75ecd 100644
--- a/src/core/CL/cl_kernels/convolution3x3.cl
+++ b/src/core/CL/cl_kernels/convolution3x3.cl
@@ -25,11 +25,11 @@
 
 #ifndef DATA_TYPE
 #define DATA_TYPE short
-#endif
+#endif /* DATA_TYPE */
 
 #ifndef DATA_TYPE_OUT
 #define DATA_TYPE_OUT uchar
-#endif
+#endif /* DATA_TYPE_OUT */
 
 /** Compute a 1D horizontal convolution of size 3 for 8 bytes assuming the input is made of 1 channel of 1 byte (i.e 8 pixels).
  *