Staging: comedi: drivers.c: Checkpatch cleanup

WARNING: Use #include <linux/io.h> instead of <asm/io.h>
+#include <asm/io.h>

WARNING: braces {} are not necessary for any arm of this statement
+	if (dev->driver) {
[...]
+	} else {
[...]

WARNING: braces {} are not necessary for single statement blocks
+	if (insn->insn == INSN_READ) {
+		data[0] = (new_data[1] >> (chan - base_bitfield_channel)) & 1;
+	}

WARNING: braces {} are not necessary for single statement blocks
+	if (async->prealloc_buf && async->prealloc_bufsz == new_size) {
+		return 0;
+	}

WARNING: braces {} are not necessary for single statement blocks
+				if (async->buf_page_list[i].virt_addr == NULL) {
+					break;
+				}

WARNING: braces {} are not necessary for single statement blocks
+	if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) {
+		nbytes = free_end - async->buf_write_alloc_count;
+	}

WARNING: braces {} are not necessary for single statement blocks
+	if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) {
+		nbytes = 0;
+	}

WARNING: braces {} are not necessary for single statement blocks
+	if (async->buf_write_ptr >= async->prealloc_bufsz) {
+		async->buf_write_ptr %= async->prealloc_bufsz;
+	}

Signed-off-by: Andrea Gelmini <andrea.gelmini@gelma.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>