[Tracker] simple patch to fix tracker-extract core dump when meet ps file on solaris

[Jerry Tan <Jerry Tan Sun COM>]

see http://bugzilla.gnome.org/show_bug.cgi?id=440142

Steps to reproduce:
1. run tracker-extract test.pc application/postscript
2. it core dump
3. 


Stack trace:
core '/work/jtan/core' of 1556: tracker-extract
/work/jtan/tmp/vim70/runtime/print/ascii.ps applicatio
fd6d94c0 strlen   (806b210, 806b440, 8052cdc, 8052cdc) + 30
080537d3 tracker_get_file_metadata (8068f60, 806aa10, fd860a98, 1) + d2
08053a43 main     (3, 8047304, 8047314) + 13e
080534dc _start   (3, 8047450, 8047460, 804748c, 0, 80474a3) + 80


simple patch for this:


Index: tracker-extract-ps.c
===================================================================
--- tracker-extract-ps.c        (revision 591)
+++ tracker-extract-ps.c        (working copy)
@@ -133,6 +133,7 @@
                        }
                        g_free (line);
                        line = NULL;
+                        length = 0;
                        getline (&line, &length, f);
                }
                g_free (line);


Jamie, please take a look.