media: atomisp: Use sysfs_emit() instead of sprintf() where appropriate

sysfs_emit() is preferred over raw sprintf() for sysfs attributes since it
knows about the sysfs buffer specifics and has some built-in sanity checks.

Link: https://lore.kernel.org/linux-media/20210513034650.252993-1-phind.uet@gmail.comSigned-off-by: Nguyen Dinh Phi <phind.uet@gmail.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_drvfs.c

@@ -96,7 +96,7 @@ static inline int iunit_dump_dbgopt(struct atomisp_device *isp,
 static ssize_t iunit_dbglvl_show(struct device_driver *drv, char *buf)
 {
 	iunit_debug.dbglvl = dbg_level;
-	return sprintf(buf, "dtrace level:%u\n", iunit_debug.dbglvl);
+	return sysfs_emit(buf, "dtrace level:%u\n", iunit_debug.dbglvl);
 }
 
 static ssize_t iunit_dbglvl_store(struct device_driver *drv, const char *buf,
@@ -115,7 +115,7 @@ static ssize_t iunit_dbglvl_store(struct device_driver *drv, const char *buf,
 static ssize_t iunit_dbgfun_show(struct device_driver *drv, char *buf)
 {
 	iunit_debug.dbgfun = atomisp_get_css_dbgfunc();
-	return sprintf(buf, "dbgfun opt:%u\n", iunit_debug.dbgfun);
+	return sysfs_emit(buf, "dbgfun opt:%u\n", iunit_debug.dbgfun);
 }
 
 static ssize_t iunit_dbgfun_store(struct device_driver *drv, const char *buf,
@@ -139,7 +139,7 @@ static ssize_t iunit_dbgfun_store(struct device_driver *drv, const char *buf,
 
 static ssize_t iunit_dbgopt_show(struct device_driver *drv, char *buf)
 {
-	return sprintf(buf, "option:0x%x\n", iunit_debug.dbgopt);
+	return sysfs_emit(buf, "option:0x%x\n", iunit_debug.dbgopt);
 }
 
 static ssize_t iunit_dbgopt_store(struct device_driver *drv, const char *buf,