[media] Fix mmap() example in the V4L2 API DocBook

Correct ioctl return value handling and fix coding style issues.

[mchehab@redhat.com: return -1 is OK, according with ioctl manpages. Reverting ioctl changes]
Signed-off-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 18 insertions, 18 deletions

diff --git a/Documentation/DocBook/v4l/io.xml b/Documentation/DocBook/v4l/io.xml
index d424886beda0..a9750437000c 100644
--- a/Documentation/DocBook/v4l/io.xml
+++ b/Documentation/DocBook/v4l/io.xml
@@ -141,63 +141,63 @@ struct {
 } *buffers;
 unsigned int i;
 
-memset (&reqbuf, 0, sizeof (reqbuf));
+memset(&reqbuf, 0, sizeof(reqbuf));
 reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 reqbuf.memory = V4L2_MEMORY_MMAP;
 reqbuf.count = 20;
 
 if (-1 == ioctl (fd, &VIDIOC-REQBUFS;, &reqbuf)) {
         if (errno == EINVAL)
-                printf ("Video capturing or mmap-streaming is not supported\n");
+                printf("Video capturing or mmap-streaming is not supported\n");
         else
-                perror ("VIDIOC_REQBUFS");
+                perror("VIDIOC_REQBUFS");
 
-        exit (EXIT_FAILURE);
+        exit(EXIT_FAILURE);
 }
 
 /* We want at least five buffers. */
 
 if (reqbuf.count < 5) {
         /* You may need to free the buffers here. */
-        printf ("Not enough buffer memory\n");
-        exit (EXIT_FAILURE);
+        printf("Not enough buffer memory\n");
+        exit(EXIT_FAILURE);
 }
 
-buffers = calloc (reqbuf.count, sizeof (*buffers));
-assert (buffers != NULL);
+buffers = calloc(reqbuf.count, sizeof(*buffers));
+assert(buffers != NULL);
 
 for (i = 0; i < reqbuf.count; i++) {
         &v4l2-buffer; buffer;
 
-        memset (&buffer, 0, sizeof (buffer));
+        memset(&buffer, 0, sizeof(buffer));
         buffer.type = reqbuf.type;
         buffer.memory = V4L2_MEMORY_MMAP;
         buffer.index = i;
 
         if (-1 == ioctl (fd, &VIDIOC-QUERYBUF;, &buffer)) {
-                perror ("VIDIOC_QUERYBUF");
-                exit (EXIT_FAILURE);
+                perror("VIDIOC_QUERYBUF");
+                exit(EXIT_FAILURE);
         }
 
         buffers[i].length = buffer.length; /* remember for munmap() */
 
-        buffers[i].start = mmap (NULL, buffer.length,
-                                 PROT_READ | PROT_WRITE, /* recommended */
-                                 MAP_SHARED,             /* recommended */
-                                 fd, buffer.m.offset);
+        buffers[i].start = mmap(NULL, buffer.length,
+                                PROT_READ | PROT_WRITE, /* recommended */
+                                MAP_SHARED,             /* recommended */
+                                fd, buffer.m.offset);
 
         if (MAP_FAILED == buffers[i].start) {
                 /* If you do not exit here you should unmap() and free()
                    the buffers mapped so far. */
-                perror ("mmap");
-                exit (EXIT_FAILURE);
+                perror("mmap");
+                exit(EXIT_FAILURE);
         }
 }
 
 /* Cleanup. */
 
 for (i = 0; i < reqbuf.count; i++)
-        munmap (buffers[i].start, buffers[i].length);
+        munmap(buffers[i].start, buffers[i].length);
       </programlisting>
     </example>