Minor fix in dds.lex - test for an error from fgets(). Closes ticket 1068.
Minor fix in dds.lex - test for an error from fgets(). Closes
ticket 1068.

OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap,OPENDAP/libdap4,OPENDAP/libdap4,OPENDAP/libdap,OPENDAP/libdap,OPENDAP/libdap,OPENDAP/libdap4