[gedit-plugins] findinfiles: use g_utf8_make_valid()

[Sébastien Wilmet <swilmet src gnome org>]

commit c1efa4e18e92fe1c5d7a79e9915a9f59f287a3bf
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Wed Nov 6 14:09:44 2019 +0100

    findinfiles: use g_utf8_make_valid()
    
    gedit_utils_make_valid_utf8() is deprecated.

 plugins/findinfiles/job.vala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/plugins/findinfiles/job.vala b/plugins/findinfiles/job.vala
index a968f93..fe846a9 100644
--- a/plugins/findinfiles/job.vala
+++ b/plugins/findinfiles/job.vala
@@ -129,7 +129,8 @@ class FindJob {
     public string extract_context (uint8 *buffer, Range range) {
         uint8 *slice = new uint8[range.to - range.from];
         Posix.memcpy (slice, buffer + range.from, range.to - range.from);
-        return Gedit.utils_make_valid_utf8 ((string)slice);
+        string slice_str = (string)slice;
+        return slice_str.make_valid();
     }
 
     public void halt () {