[PATCH] misc: echo: Remove unnecessary parentheses and simplify check for zero

[Nathan Chancellor <natechancellor@gmail.com>]

Clang warns when multiple pairs of parentheses are used for a single
conditional statement.

drivers/misc/echo/echo.c:384:27: warning: equality comparison with
extraneous parentheses [-Wparentheses-equality]
        if ((ec->nonupdate_dwell == 0)) {
             ~~~~~~~~~~~~~~~~~~~~^~~~
drivers/misc/echo/echo.c:384:27: note: remove extraneous parentheses
around the comparison to silence this warning
        if ((ec->nonupdate_dwell == 0)) {
            ~                    ^   ~
drivers/misc/echo/echo.c:384:27: note: use '=' to turn this equality
comparison into an assignment
        if ((ec->nonupdate_dwell == 0)) {
                                 ^~
                                 =
1 warning generated.

Remove them and while we're at it, simplify the zero check as '!var' is
used more than 'var == 0'.

Reported-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
---
 drivers/misc/echo/echo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/echo/echo.c b/drivers/misc/echo/echo.c
index 8a5adc0d2e88..3ebe5d75ad6a 100644
--- a/drivers/misc/echo/echo.c
+++ b/drivers/misc/echo/echo.c
@@ -381,7 +381,7 @@ int16_t oslec_update(struct oslec_state *ec, int16_t tx, int16_t rx)
 	 */
 	ec->factor = 0;
 	ec->shift = 0;
-	if ((ec->nonupdate_dwell == 0)) {
+	if (!ec->nonupdate_dwell) {
 		int p, logp, shift;
 
 		/* Determine:
-- 
2.18.0