pccardctl: remove superfluous check

We can trust our own callers. Fixes:

 src/pccardctl.c:82: warning: the address of 'in_file' will always evaluate as 'true'

Reported-by: Alexander Mansurov <alexander.mansurov@gmail.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/src/pccardctl.c b/src/pccardctl.c
index fe0c8c9..a59aff9 100644
--- a/src/pccardctl.c
+++ b/src/pccardctl.c
@@ -79,9 +79,6 @@
         char file[SYSFS_PATH_MAX];
         struct sysfs_attribute *attr;
 
-	if (!in_file)
-		return -EINVAL;
-
         snprintf(file, SYSFS_PATH_MAX, "/sys/class/pcmcia_socket/pcmcia_socket%lu/%s",
                  socket_no, in_file);