[glib/wip/pwithnall/freebsd-math: 2/3] gdatetime: Use isnan() instead of !isfinite()

[Philip Withnall <pwithnall src gnome org>]

commit 50a3d0bf9def8f1b2c62b11dfba72189c44b77f9
Author: Philip Withnall <pwithnall endlessos org>
Date:   Fri Dec 11 15:39:47 2020 +0000

    gdatetime: Use isnan() instead of !isfinite()
    
    Both are provided by libm, but `isnan()` is provided as a macro, whereas
    `isfinite()` is an actual function, and hence libm has to be available
    at runtime. That didn’t trivially work on FreeBSD, resulting in this
    refactor.
    
    `isfinite(x)` is equivalent to `!isnan(x) && !isinfinite(x)`. The case
    of `x` being (negative or positive) infinity is already handled by the
    range checks on the next line, so it’s safe to switch to `isnan()` here.
    
    Signed-off-by: Philip Withnall <pwithnall endlessos org>

 glib/gdatetime.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/glib/gdatetime.c b/glib/gdatetime.c
index 05e31202a..1d17d862f 100644
--- a/glib/gdatetime.c
+++ b/glib/gdatetime.c
@@ -1588,7 +1588,7 @@ g_date_time_new (GTimeZone *tz,
       day < 1 || day > days_in_months[GREGORIAN_LEAP (year)][month] ||
       hour < 0 || hour > 23 ||
       minute < 0 || minute > 59 ||
-      !isfinite (seconds) ||
+      isnan (seconds) ||
       seconds < 0.0 || seconds >= 60.0)
     return NULL;