staging: hp100: Add space around operator

Add space around "-" operator to improve code readability and adhere to
the Linux kernel coding style.
Reported by checkpatch.pl
Signed-off-by: Soumyajit Deb <debsoumyajit100@gmail.com>
Link: https://lore.kernel.org/r/20200325144353.42655-1-debsoumyajit100@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/hp/hp100.c

@@ -2930,7 +2930,7 @@ MODULE_DESCRIPTION("HP CASCADE Architecture Driver for 100VG-AnyLan Network Adap
 #if defined(MODULE) && defined(CONFIG_ISA)
 #define HP100_DEVICES 5
 /* Parameters set by insmod */
-static int hp100_port[HP100_DEVICES] = { 0, [1 ... (HP100_DEVICES-1)] = -1 };
+static int hp100_port[HP100_DEVICES] = { 0, [1 ... (HP100_DEVICES - 1)] = -1 };
 module_param_hw_array(hp100_port, int, ioport, NULL, 0);
 
 /* List of devices */