ff_fragment_shader: Silence unused parameter warning in smear
ff_fragment_shader: Silence unused parameter warning in smear

Just remove the parameter.  Silences:

../../src/mesa/main/ff_fragment_shader.cpp:668:1: warning: unused parameter 'p' [-Wunused-parameter]

Signed-off-by: Ian Romanick <2b237cafb16dc45038e85df6c85e74e6d899eba9@intel.com>
Reviewed-by: Brian Paul <3cb4e1df5ec4da2c7c4af7c52cec8cf340a55a10@vmware.com>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>
Reviewed-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler