bus: bt1-axi: Use sysfs_streq instead of strncmp

There is a ready-to-use method to compare a retrieved from a sysfs node
string with another string. It treats both NUL and newline-then-NUL as
equivalent string terminations. So use it instead of manually truncating
the line length in the strncmp() method.

Link: https://lore.kernel.org/r/20200528145050.5203-6-Sergey.Semin@baikalelectronics.ruSigned-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Olof Johansson <olof@lixom.net>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: soc@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

drivers/bus/bt1-axi.c

@@ -220,9 +220,9 @@ static ssize_t inject_error_store(struct device *dev,
 	 * error while unaligned writing - the AXI bus write error handled
 	 * by this driver.
 	 */
-	if (!strncmp(data, "bus", 3))
+	if (sysfs_streq(data, "bus"))
 		readb(axi->qos_regs);
-	else if (!strncmp(data, "unaligned", 9))
+	else if (sysfs_streq(data, "unaligned"))
 		writeb(0, axi->qos_regs);
 	else
 		return -EINVAL;