Apply suggestions from code review

Co-authored-by: Jameson Nash <vtjnash@gmail.com>

Author: xal-0

src/dlload.c

@@ -256,6 +256,7 @@ void *jl_find_dynamic_library_by_addr(void *symbol, int throw_err, int close) JL
             jl_error("could not load base module");
         return NULL;
     }
+    dlerror();
     handle = dlopen(info.dli_fname, RTLD_NOW | RTLD_NOLOAD | RTLD_LOCAL);
 #if defined(_OS_FREEBSD_)
     // FreeBSD will not give you a handle for the executable if you dlopen() it
@@ -292,7 +293,7 @@ JL_DLLEXPORT void *jl_load_dynamic_library(const char *modname, unsigned flags,
 
     // modname == NULL is a sentinel value requesting the handle of libjulia-internal
     if (modname == NULL)
-        return jl_find_dynamic_library_by_addr(&jl_load_dynamic_library, throw_err, 1);
+        return jl_libjulia_internal_handle;
 
     abspath = jl_isabspath(modname);
     is_atpath = 0;

src/threading.c

@@ -461,7 +461,7 @@ JL_DLLEXPORT jl_gcframe_t **jl_autoinit_and_adopt_thread(void)
 {
     if (!jl_is_initialized()) {
         void *retaddr = __builtin_extract_return_addr(__builtin_return_address(0));
-        void *handle = jl_find_dynamic_library_by_addr(retaddr, 0, 1);
+        void *handle = jl_find_dynamic_library_by_addr(retaddr, 0, 0);
         if (handle == NULL) {
             fprintf(stderr, "error: runtime auto-initialization failed due to bad sysimage lookup\n"
                             "       (this should not happen, please file a bug report)\n");