r600/sfn: Don't check the faction when searching for the input slot

All loads from the same driver location are merged into one variable,
so there is no need to check the frachtion.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10608>

src/gallium/drivers/r600/sfn/sfn_shaderio.cpp

@@ -416,7 +416,7 @@ ShaderInput& ShaderIO::input(size_t driver_loc, int frac)
          continue;
 
       auto& v = static_cast<ShaderInputVarying&>(*i);
-      if (v.location() == driver_loc && v.location_frac() == frac)
+      if (v.location() == driver_loc)
          return v;
    }
    return input(driver_loc);