staging: bcm2835-audio: Enclose complex macro value in parentheses

This patch fixes the checkpatch.pl error:

ERROR: Macros with complex values should be enclosed in parentheses
Signed-off-by: Diego Roux <me@diegoroux04.dynv6.net>
Link: https://lore.kernel.org/r/20210716024909.39411-1-me@diegoroux04.dynv6.netSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-audio/bcm2835.h

@@ -22,7 +22,7 @@ enum {
 /* macros for alsa2chip and chip2alsa, instead of functions */
 
 // convert alsa to chip volume (defined as macro rather than function call)
-#define alsa2chip(vol) (uint)(-(((vol) << 8) / 100))
+#define alsa2chip(vol) ((uint)(-(((vol) << 8) / 100)))
 
 // convert chip to alsa volume
 #define chip2alsa(vol) -(((vol) * 100) >> 8)