checker: free fixed array

[enghitalo]

Describe the bug

checker is allowing free fixed array

Reproduction Steps

fn main() {
	mut buffer := [u8(`0`), `0`, `0`, `0`, `-`, `0`, `0`, `-`, `0`, `0`, `T`, `0`, `0`, `:`, `0`, `0`, `:`, `0`, `0`, `.`, `0`, `0`, `0`, `Z`]!
	defer {
		unsafe { buffer.free() }
	}
}

Expected Behavior

A nice error

Current Behavior

[24]u8
could not generate free method 'Array_fixed_u8_24_free' for type 'Array_fixed_u8_24'
==================
/tmp/v_1000/discardable.11898467953784003877.tmp.c:12674: error: lvalue expected
...
==================
(Use `v -cg` to print the entire error message)

builder error: 
==================
C error. This should never happen.

This is a compiler bug, please report it using `v bug file.v`.

https://github.com/vlang/v/issues/new/choose

You can also use #help on Discord: https://discord.gg/vlang

Possible Solution

No response

Additional Information/Context

No response

V version

V 0.4.3 9694024

Environment details (OS name and version, etc.)

Ubuntu

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