phc_ctl: fix adj command to accept negative offset.

When parsing the argument, the minimum value should be -DBL_MAX instead
of DBL_MIN, which is the smallest positive value.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>

phc_ctl.c

@@ -268,7 +268,7 @@ static int do_adj(clockid_t clkid, int cmdc, char *cmdv[])
 	}
 
 	/* parse the double time offset argument */
-	r = get_ranged_double(cmdv[0], &time_arg, DBL_MIN, DBL_MAX);
+	r = get_ranged_double(cmdv[0], &time_arg, -DBL_MAX, DBL_MAX);
 	switch (r) {
 	case PARSED_OK:
 		break;