core: fix off-by-one error in node::DLOpen()
core: fix off-by-one error in node::DLOpen()

Fixes loading of modules that use the NODE_MODULE macro on POSIX platforms.

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node