Fix several typo/warning/unused-code issues (#2655)

- Fix typo in wamr-test-suites script
- Fix compilation warnings in libc-wasi posix.c
- Remove unused code fast-jit jit_frontend.c
- Remove duplicated exception print in `iwasm -f <function>`
- Fix return value in void function wasm_runtime_set_wasi_ctx

tests/wamr-test-suites/test_wamr.sh

@@ -386,7 +386,7 @@ function spec_test()
         git apply ../../spec-test-script/simd_ignore_cases.patch
     fi
     if [[ ${ENABLE_MULTI_MODULE} == 1 && $1 == 'aot'  ]]; then
-        git apply ../../spec-test-script/muti_module_aot_ignore_cases.patch
+        git apply ../../spec-test-script/multi_module_aot_ignore_cases.patch
     fi
 
     # udpate thread cases
@@ -948,4 +948,4 @@ fi
 echo -e "Test finish. Reports are under ${REPORT_DIR}"
 DEBUG set +xv pipefail
 echo "TEST SUCCESSFUL"
-exit 0
+exit 0