Typo fix in libswd.h by Chris Kilgour.
Typo fix in libswd.h by Chris Kilgour.

shangdawei/LibSWD,ongjohn/LibSWD,shangdawei/LibSWD,cedar-renjun/LibSWD,cedar-renjun/LibSWD,shangdawei/LibSWD,cedar-renjun/LibSWD,ongjohn/LibSWD,ongjohn/LibSWD