glsl: Initialize patch member of glsl_struct_field

There is apparently a subtle difference in C++ between

    F f;

and

    F f();

The former will use the default constructor.  If there is no default
constructor specified, the compiler provides one that simply invokes the
default constructor for each field.  For built-in basic types, the
default constructor does nothing.  The later will, according to
http://stackoverflow.com/questions/2417065/does-the-default-constructor-initialize-built-in-types)
perform value-initialization of the type.  For built-in types this means
initializing to zero.

The per_vertex_accumulator constructor is:

    per_vertex_accumulator::per_vertex_accumulator()
       : fields(),
         num_fields(0)
    {
    }

This is the second form of constructor, so the glsl_struct_field
objects were previously zero initialized.  With the addition of an empty
default constructor in commit 7ac946e5, per_vertex_accumulator::fields
receive no initialization.

Fixes a bunch of random (mostly tessellation related) piglit failures
since commit 7ac946e5 ("glsl: Add constuctors for the common cases of
glsl_struct_field").

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91544
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/glsl/builtin_variables.cpp

@@ -322,6 +322,7 @@ per_vertex_accumulator::add_field(int slot, const glsl_type *type,
    this->fields[this->num_fields].interpolation = INTERP_QUALIFIER_NONE;
    this->fields[this->num_fields].centroid = 0;
    this->fields[this->num_fields].sample = 0;
+   this->fields[this->num_fields].patch = 0;
    this->num_fields++;
 }
 
@@ -1159,6 +1160,7 @@ builtin_variable_generator::generate_varyings()
          var->data.interpolation = fields[i].interpolation;
          var->data.centroid = fields[i].centroid;
          var->data.sample = fields[i].sample;
+         var->data.patch = fields[i].patch;
          var->init_interface_type(per_vertex_out_type);
       }
    }