glsl: Remove redundant writes to prog->LinkStatus

The linker_error() function sets prog->LinkStatus to false.  There's
no reason for the caller of linker_error() to also do so.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/mesa/program/ir_to_mesa.cpp

@@ -3108,7 +3108,6 @@ _mesa_glsl_link_shader(struct gl_context *ctx, struct gl_shader_program *prog)
    for (i = 0; i < prog->NumShaders; i++) {
       if (!prog->Shaders[i]->CompileStatus) {
 	 linker_error(prog, "linking with uncompiled shader");
-	 prog->LinkStatus = GL_FALSE;
       }
    }