Fix a copy-paste error in d_double_has_nan description

diff --git a/U/perl/longdblfio.U b/U/perl/longdblfio.U
index 75ce231..81da432 100644 (file)
--- a/U/perl/longdblfio.U
+++ b/U/perl/longdblfio.U
@@ -105,7 +105,7 @@
 ?S:    which indicates that the double type has an infinity.
 ?S:.
 ?S:d_double_has_nan:
-?S:    This variable conditionally defines the symbol DOUBLE_HAS_INF
+?S:    This variable conditionally defines the symbol DOUBLE_HAS_NAN
 ?S:    which indicates that the double type has a not-a-number.
 ?S:.
 ?S:d_double_has_negative_zero: