omxil: Remove an unused struct member

Additionally, the mutex never seem to have been released but
just leaked.
Signed-off-by: Martin Storsjö <martin@martin.st>

modules/codec/omxil/omxil.c

@@ -928,7 +928,6 @@ loaded:
     p_sys->pp_last_event = &p_sys->p_events;
     vlc_mutex_init (&p_sys->mutex);
     vlc_cond_init (&p_sys->cond);
-    vlc_mutex_init (&p_sys->lock);
     vlc_mutex_init (&p_sys->in.fifo.lock);
     vlc_cond_init (&p_sys->in.fifo.wait);
     p_sys->in.fifo.offset = offsetof(OMX_BUFFERHEADERTYPE, pOutputPortPrivate) / sizeof(void *);

modules/codec/omxil/omxil.h

@@ -81,7 +81,6 @@ struct decoder_sys_t
 
     bool b_enc;
     bool b_init;
-    vlc_mutex_t lock;
 
     char psz_component[OMX_MAX_STRINGNAME_SIZE];
     char ppsz_components[MAX_COMPONENTS_LIST_SIZE][OMX_MAX_STRINGNAME_SIZE];