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--- a/networking/brctl.c
+++ b/networking/brctl.c
@@ -34,8 +34,9 @@ static ALWAYS_INLINE void strtotimeval(s
 {
 	double secs;
 #if BRCTL_USE_INTERNAL
+	errno = 0;
 	secs = /*bb_*/strtod(time_str, NULL);
-	if (!secs)
+	if (errno)
 #else
 	if (sscanf(time_str, "%lf", &secs) != 1)
 #endif