fixed memleak pointed out by xtophe in previous commit

src/libvlc-common.c

@@ -915,7 +915,10 @@ int libvlc_InternalInit( libvlc_int_t *p_libvlc, int i_argc, char *ppsz_argv[] )
             char *psz_morecodecs;
             asprintf(&psz_morecodecs, "%s,dmo,quicktime", psz_codecs);
             if( psz_morecodecs )
+            {
                 config_PutPsz( p_libvlc, "codec", psz_morecodecs);
+                free(psz_morecodecs);
+            }
         }
         else
             config_PutPsz( p_libvlc, "codec", "dmo,quicktime");