Fix incorrect conversion from int to size_t due to PR 66552. (dotnet#…

…66721)

dotnet#66552 did incorrect switch
to size_t from int in a sections that expects variable to go negative.

src/mono/mono/metadata/assembly.c

@@ -2139,10 +2139,8 @@ mono_assembly_request_load_from (MonoImage *image, const char *fname,
 		gchar *tmp_fn;
 
 		tmp_fn = g_strdup (fname);
-		for (size_t i = strlen (tmp_fn) - 1; i >= 0; i--) {
-			if (tmp_fn [i] == '/')
-				tmp_fn [i] = '\\';
-		}
+
+		g_strdelimit (tmp_fn, '/', '\\');
 
 		base_dir = absolute_dir (tmp_fn);
 		g_free (tmp_fn);

src/mono/mono/metadata/icall.c

@@ -167,9 +167,7 @@ is_generic_parameter (MonoType *type)
 static void
 mono_icall_make_platform_path (gchar *path)
 {
-	for (size_t i = strlen (path); i > 0; i--)
-		if (path [i-1] == '\\')
-			path [i-1] = '/';
+	g_strdelimit (path, '\\', '/');
 }
 
 static const gchar *

src/mono/mono/metadata/w32handle.c

@@ -508,7 +508,7 @@ mono_w32handle_ops_prewait (MonoW32Handle *handle_data)
 static void
 mono_w32handle_unlock_handles (MonoW32Handle **handles_data, gsize nhandles)
 {
-	for (gsize i = nhandles - 1; i >= 0; i--) {
+	for (int i = ((int)nhandles - 1); i >= 0; i--) {
 		if (!handles_data [i])
 			continue;
 		mono_w32handle_unlock (handles_data [i]);