Fix issue of resolving func name in custom name section (#1849)

Should use import_function_count but not import_count to calculate
the func_index in handle_name_section when custom name section
feature is enabled.

And clear the compile warnings of mini loader.

core/iwasm/interpreter/wasm_loader.c

@@ -2806,8 +2806,8 @@ handle_name_section(const uint8 *buf, const uint8 *buf_end, WASMModule *module,
                         read_leb_uint32(p, p_end, func_name_len);
                         CHECK_BUF(p, p_end, func_name_len);
                         /* Skip the import functions */
-                        if (func_index >= module->import_count) {
-                            func_index -= module->import_count;
+                        if (func_index >= module->import_function_count) {
+                            func_index -= module->import_function_count;
                             if (func_index >= module->function_count) {
                                 set_error_buf(error_buf, error_buf_size,
                                               "out-of-range function index");

core/iwasm/interpreter/wasm_mini_loader.c

@@ -1708,8 +1708,8 @@ handle_name_section(const uint8 *buf, const uint8 *buf_end, WASMModule *module,
                         read_leb_uint32(p, p_end, func_name_len);
                         CHECK_BUF(p, p_end, func_name_len);
                         /* Skip the import functions */
-                        if (func_index >= module->import_count) {
-                            func_index -= module->import_count;
+                        if (func_index >= module->import_function_count) {
+                            func_index -= module->import_function_count;
                             bh_assert(func_index < module->function_count);
                             if (!(module->functions[func_index]->field_name =
                                       const_str_list_insert(
@@ -1733,6 +1733,8 @@ handle_name_section(const uint8 *buf, const uint8 *buf_end, WASMModule *module,
         i++;
     }
 
+    (void)previous_name_type;
+    (void)previous_func_index;
     return true;
 }
 #endif