glodGetError - Reports the most recently recorded GLOD error
This call is used to query the most recent GLOD error. It operates
glGetError() in that it returns the first error to occur
since the error flag was last cleared. Calling
clears the error flag, so the next error to follow will be recorded.
If no errors have occured since the last call to
GLOD_NO_ERROR is returned. Otherwise, a positive error value is
returned (see glod.h for a current list).