freedreno/ir3: fixup register footprint fixup

Small typo resulted in not converting footprint to vec4, meaning that we
could potentially ask for quite a few more registers than required

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

src/freedreno/ir3/ir3_shader.c

@@ -118,7 +118,7 @@ fixup_regfootprint(struct ir3_shader_variant *v, uint32_t gpu_id)
 				v->info.max_reg = MAX2(v->info.max_reg, regid >> 3);
 			}
 		} else {
-			v->info.max_reg = MAX2(v->info.max_reg, regid);
+			v->info.max_reg = MAX2(v->info.max_reg, regid >> 2);
 		}
 	}
 }