[easytag] Fix CRC calculation function return value

[David King <davidk src gnome org>]

commit 311128b0cdee64f5a72aec396e8d16322fd17b65
Author: David King <amigadave amigadave com>
Date:   Sun May 19 11:15:50 2013 +0100

    Fix CRC calculation function return value
    
    Return TRUE on success and FALSE on error, as mentioned in the
    crc32_file_with_ID3_tag documentation comment. Do not try to close a
    NULL file stream pointer.

 src/crc32.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/src/crc32.c b/src/crc32.c
index 3ea807c..a3426b2 100644
--- a/src/crc32.c
+++ b/src/crc32.c
@@ -125,7 +125,7 @@ crc32_file_with_ID3_tag (gchar *filename, guint32 *crc32)
 
     if ((fd = fopen (filename, "r")) == NULL)
     {
-        goto error;
+        return FALSE;
     }
 
     /* Check if there is an ID3v1 tag. */
@@ -187,11 +187,16 @@ crc32_file_with_ID3_tag (gchar *filename, guint32 *crc32)
         }
     }
 
+    if (!feof (fd))
+    {
+        goto error;
+    }
+
 out:
     fclose (fd);
     *crc32 = ~crc;
 
-    return nr < 0;
+    return nr == 0;
 
 error:
     nr = -1;