video: fbdev: replace snprintf in show functions with sysfs_emit

coccicheck complains about the use of snprintf() in sysfs show functions.

Fix the coccicheck warning:
WARNING: use scnprintf or sprintf.

Use sysfs_emit instead of scnprintf or sprintf makes more sense.
Signed-off-by: Qing Wang <wangqing@vivo.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1634095680-4377-1-git-send-email-wangqing@vivo.com

drivers/video/fbdev/core/fbsysfs.c

@@ -230,7 +230,7 @@ static ssize_t show_bpp(struct device *device, struct device_attribute *attr,
 			char *buf)
 {
 	struct fb_info *fb_info = dev_get_drvdata(device);
-	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.bits_per_pixel);
+	return sysfs_emit(buf, "%d\n", fb_info->var.bits_per_pixel);
 }
 
 static ssize_t store_rotate(struct device *device,
@@ -257,7 +257,7 @@ static ssize_t show_rotate(struct device *device,
 {
 	struct fb_info *fb_info = dev_get_drvdata(device);
 
-	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->var.rotate);
+	return sysfs_emit(buf, "%d\n", fb_info->var.rotate);
 }
 
 static ssize_t store_virtual(struct device *device,
@@ -285,7 +285,7 @@ static ssize_t show_virtual(struct device *device,
 			    struct device_attribute *attr, char *buf)
 {
 	struct fb_info *fb_info = dev_get_drvdata(device);
-	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xres_virtual,
+	return sysfs_emit(buf, "%d,%d\n", fb_info->var.xres_virtual,
 			fb_info->var.yres_virtual);
 }
 
@@ -293,7 +293,7 @@ static ssize_t show_stride(struct device *device,
 			   struct device_attribute *attr, char *buf)
 {
 	struct fb_info *fb_info = dev_get_drvdata(device);
-	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->fix.line_length);
+	return sysfs_emit(buf, "%d\n", fb_info->fix.line_length);
 }
 
 static ssize_t store_blank(struct device *device,
@@ -381,7 +381,7 @@ static ssize_t show_pan(struct device *device,
 			struct device_attribute *attr, char *buf)
 {
 	struct fb_info *fb_info = dev_get_drvdata(device);
-	return snprintf(buf, PAGE_SIZE, "%d,%d\n", fb_info->var.xoffset,
+	return sysfs_emit(buf, "%d,%d\n", fb_info->var.xoffset,
 			fb_info->var.yoffset);
 }
 
@@ -390,7 +390,7 @@ static ssize_t show_name(struct device *device,
 {
 	struct fb_info *fb_info = dev_get_drvdata(device);
 
-	return snprintf(buf, PAGE_SIZE, "%s\n", fb_info->fix.id);
+	return sysfs_emit(buf, "%s\n", fb_info->fix.id);
 }
 
 static ssize_t store_fbstate(struct device *device,
@@ -418,7 +418,7 @@ static ssize_t show_fbstate(struct device *device,
 			    struct device_attribute *attr, char *buf)
 {
 	struct fb_info *fb_info = dev_get_drvdata(device);
-	return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state);
+	return sysfs_emit(buf, "%d\n", fb_info->state);
 }
 
 #if IS_ENABLED(CONFIG_FB_BACKLIGHT)