scripts/generate_clear_kernel: Improve usage instructions.

Fix the script name and make the path to mesa i915_asm a bit
more clear

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Petri Latvala <petri.latvala@intel.com>

scripts/generate_clear_kernel.sh

@@ -26,7 +26,7 @@
 export ASSEMBLY_SOURCE=./lib/i915/shaders/clear_kernel
 
 function get_help {
-        echo "Usage:    asm_eu_kernel.sh [options]"
+        echo "Usage: ${0} [options]"
         echo "Note: hsw_clear_kernel.c/ivb_clear_kernel.c automatically generated by this script should never be modified - it would be imported to i915, to use as it is..."
         echo " "
         echo "Please make sure your Mesa tool is compiled with "-Dtools=intel" and "-Ddri-drivers=i965", and run this script from IGT source root directory"
@@ -37,7 +37,7 @@ function get_help {
         echo " -o=name_of_file          output file to store Mesa assembled c-literal for the device - If none specified, default file will be used - ivb/hsw-cb_assembled"
         echo " -m=mesa                  Path to Mesa i965_asm binary"
         echo " "
-        echo " Usage example: \"scripts/generate_clear_kernel.sh -g hsw -o hsw_clear_buffer.h -m /path/to/Mesa/i965_asm/binary\""
+        echo " Usage example: \"./scripts/generate_clear_kernel.sh -g hsw -o hsw_clear_buffer.h -m ~/mesa/build/src/intel/tools/i965_asm\""
 }
 
 function include_array # $1=array_name - update Mesa output with desired format