[sound-juicer] Fix -Wsign-compare warning

[Phillip Wood <pwood src gnome org>]

commit f2ad4683f1e93983cd54d7ab30d2f7049510b1fd
Author: Phillip Wood <phillip wood dunelm org uk>
Date:   Fri Feb 3 11:30:01 2017 +0000

    Fix -Wsign-compare warning
    
    max_realfile needs to be an int as it’s passed to printf to control the
    field width but strlen returns size_t. The casts are a bit ugly but the
    strings are filenames so shouldn’t overflow an int.

 src/sj-extracting.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/sj-extracting.c b/src/sj-extracting.c
index 0d17c00..bc40abf 100644
--- a/src/sj-extracting.c
+++ b/src/sj-extracting.c
@@ -133,7 +133,7 @@ build_filename (const TrackDetails *track, gboolean temp_filename, GError **erro
   GFile *uri, *new;
   gchar *realfile, *realpath, *filename, *scheme;
   const gchar *extension;
-  size_t len_extension;
+  int len_extension;
   int max_realfile = INT_MAX;
   GstEncodingProfile *profile;
 
@@ -155,7 +155,7 @@ build_filename (const TrackDetails *track, gboolean temp_filename, GError **erro
       gst_encoding_profile_unref (profile);
   }
 
-  len_extension = 1 + strlen (extension);
+  len_extension = 1 + (int) strlen (extension);
 #if defined(NAME_MAX) && NAME_MAX > 0
   max_realfile = NAME_MAX - len_extension;
 #endif /* NAME_MAX */
@@ -163,7 +163,7 @@ build_filename (const TrackDetails *track, gboolean temp_filename, GError **erro
   scheme = g_file_get_uri_scheme (uri);
   if (scheme && !strcmp (scheme, "file")) {
     gchar *path = g_file_get_path (uri);
-    size_t len_path = strlen (path) + 1;
+    int len_path = (int) strlen (path) + 1;
     max_realfile = MIN (max_realfile, PATH_MAX - len_path - len_extension);
     g_free (path);
   }