[MEDIA]: Make read operations return correct ssize_t in {c-qcam,bw-qcam,w9966}.c

drivers/media/video/bw-qcam.c

@@ -856,7 +856,7 @@ static int qcam_ioctl(struct inode *inode, struct file *file,
 	return video_usercopy(inode, file, cmd, arg, qcam_do_ioctl);
 }
 
-static int qcam_read(struct file *file, char *buf,
+static ssize_t qcam_read(struct file *file, char *buf,
 			 size_t count, loff_t *ppos)
 {
 	struct video_device *v = video_devdata(file);

drivers/media/video/c-qcam.c

@@ -668,7 +668,7 @@ static int qcam_ioctl(struct inode *inode, struct file *file,
 	return video_usercopy(inode, file, cmd, arg, qcam_do_ioctl);
 }
 
-static int qcam_read(struct file *file, char *buf,
+static ssize_t qcam_read(struct file *file, char *buf,
 			 size_t count, loff_t *ppos)
 {
 	struct video_device *v = video_devdata(file);

drivers/media/video/w9966.c

@@ -179,7 +179,7 @@ static int w9966_i2c_rbyte(struct w9966_dev* cam);
 
 static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
 			   unsigned int cmd, unsigned long arg);
-static int w9966_v4l_read(struct file *file, char *buf,
+static ssize_t w9966_v4l_read(struct file *file, char *buf,
 			      size_t count, loff_t *ppos);
 
 static struct file_operations w9966_fops = {
@@ -867,7 +867,7 @@ static int w9966_v4l_ioctl(struct inode *inode, struct file *file,
 }
 
 // Capture data
-static int w9966_v4l_read(struct file *file, char *buf,
+static ssize_t w9966_v4l_read(struct file *file, char *buf,
 			      size_t count, loff_t *ppos)
 {
 	struct video_device *vdev = video_devdata(file);