perf symbol: Simplify kernel module checking

In dso__load(), it checks if the dso is a kernel module by looking the
symtab type.  Actually dso has 'is_kmod' field to check that easily and
dso__set_module_info() set the symtab type and the is_kmod bit.  So it
should have the same result to check the is_kmod bit.
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240621170528.608772-3-namhyung@kernel.org

tools/perf/util/symbol.c

@@ -1817,10 +1817,7 @@ int dso__load(struct dso *dso, struct map *map)
 		goto out;
 	}
 
-	kmod = dso__symtab_type(dso) == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE ||
-		dso__symtab_type(dso) == DSO_BINARY_TYPE__SYSTEM_PATH_KMODULE_COMP ||
-		dso__symtab_type(dso) == DSO_BINARY_TYPE__GUEST_KMODULE ||
-		dso__symtab_type(dso) == DSO_BINARY_TYPE__GUEST_KMODULE_COMP;
+	kmod = dso__is_kmod(dso);
 
 	if (dso__kernel(dso) && !kmod) {
 		if (dso__kernel(dso) == DSO_SPACE__KERNEL)