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led-class-flash: fix -Wrestrict warning 

gcc-11 warns when building with W=1:

drivers/leds/led-class-flash.c: In function 'flash_fault_show':
drivers/leds/led-class-flash.c:210:16: error: 'sprintf' argument 3 overlaps destination object 'buf' [-Werror=restrict]
  210 |         return sprintf(buf, "%s\n", buf);
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~
drivers/leds/led-class-flash.c:187:54: note: destination object referenced by 'restrict'-qualified argument 1 was declared here
  187 |                 struct device_attribute *attr, char *buf)
      |                                                ~~~~~~^~~

There is no need for the sprintf() here when a strcat() does
the same thing without invoking undefined behavior.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Arnd Bergmann 2021-09-27 15:15:47 +02:00 committed by Pavel Machek
parent 6880fa6c56
commit 811b5440c6
1 changed files with 1 additions and 1 deletions
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2
drivers/leds/led-class-flash.c
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@ -207,7 +207,7 @@ static ssize_t flash_fault_show(struct device *dev,
mask <<= 1;
}
return sprintf(buf, "%s\n", buf);
return strlen(strcat(buf, "\n"));
}
static DEVICE_ATTR_RO(flash_fault);