fix nasty memory-related crashes caused by not noticing a bug in getmntinfo() on OS X, which disallows free()-ing memory allocated by that function

git-svn-id: svn://localhost/ardour2/branches/3.0@11211 d708f5d6-7413-0410-9779-e7cbd77b26cf

libs/pbd/mountpoint.cc

@@ -147,7 +147,11 @@ mountpoint (string path)
 		}
 	}
 
+	/* From the manpage, under "BUGS" : "The memory allocated by getmntinfo() cannot be free(3)'d by the 
+	   application."
+
 	   free(mntbufp);
+	*/
 	
 	return best;
 }