Fix a equality check typo.

Fixes bad code generation when assigning to vector.x in a function with no
parameters and the vector is the first local var.

tools/qfcc/source/expr_assign.c

@@ -239,7 +239,7 @@ static __attribute__((pure)) int
 is_const_ptr (expr_t *e)
 {
 	if ((e->type != ex_value || e->e.value->lltype != ev_pointer)
-		|| !(POINTER_VAL (e->e.value->v.pointer) > 0
+		|| !(POINTER_VAL (e->e.value->v.pointer) >= 0
 			 && POINTER_VAL (e->e.value->v.pointer) < 65536)) {
 		return 1;
 	}

tools/qfcc/test/vecinit.r

@@ -8,6 +8,20 @@ foo (float x, float y, float z)
 	return v;
 }
 
+float w;
+float h;
+
+vector
+bar (void)
+{
+	vector      pos;
+
+	pos.x = w;
+	pos.y = h;
+	pos.z = 0;
+	return pos;
+}
+
 int
 main ()
 {