libqos: Correct memory leak

Fix a small memory leak inside of libqos, in the pc_alloc_init routine.
Signed-off-by: NJohn Snow <jsnow@redhat.com>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

tests/libqos/malloc-pc.c

@@ -67,5 +67,8 @@ QGuestAllocator *pc_alloc_init(void)
     /* Respect PCI hole */
     s->end = MIN(ram_size, 0xE0000000);
 
+    /* clean-up */
+    g_free(fw_cfg);
+
     return &s->alloc;
 }