util/path: Use the GLib memory allocation routines

util/path: Use the GLib memory allocation routines

In this file, we don't check the return value of malloc/strdup/realloc which may fail.
Instead of using these routines, we use the GLib memory APIs g_malloc/g_strdup/g_realloc.
They will exit on allocation failure, so there is no need to test for failure,
which would be fine for setup.

Signed-off-by: zhanghailiang <[email protected]>
Reviewed-by: Alex Bennée <[email protected]>
Signed-off-by: Michael Tokarev <[email protected]>