Use the more-asserts crate in more places.

This provides assert_le, assert_lt, and so on, which can print the
values of the operands.

crates/wasi-c/src/syscalls.rs

@@ -1385,7 +1385,7 @@ syscalls! {
             return return_encoded_errno(e);
         }
 
-        assert!(in_.len() == host_out.len());
+        assert_eq!(in_.len(), host_out.len());
 
         let e = host::wasmtime_ssp_poll_oneoff(
             curfds,

crates/wasi-c/src/translate.rs

@@ -1,6 +1,7 @@
 use crate::host;
 use crate::wasm32;
 use core::convert::TryFrom;
+use more_asserts::assert_le;
 use std::mem::{align_of, size_of, zeroed};
 use std::slice;
 use wasmtime_runtime::{Export, VMContext};
@@ -571,6 +572,6 @@ pub unsafe fn encode_filestat_byref(
 }
 
 pub fn encode_errno(e: host::__wasi_errno_t) -> wasm32::__wasi_errno_t {
-    assert!(e <= wasm32::__WASI_ENOTCAPABLE);
+    assert_le!(e, wasm32::__WASI_ENOTCAPABLE);
     e
 }