CodingStyle: mention bitfields/whitespace style, prefer (!foo) in examples

[Pavel Machek <pavel@ucw.cz>]

Mention whitespace and bitfields style, prefer (!foo) to (foo == NULL)
in examples.

Signed-off-by: Pavel Machek <pavel@suse.cz>

diff --git a/Documentation/CodingStyle b/Documentation/CodingStyle
index 7f1730f..1595a45 100644
--- a/Documentation/CodingStyle
+++ b/Documentation/CodingStyle
@@ -71,6 +71,15 @@ used for indentation, and the above exam
 
 Get a decent editor and don't leave whitespace at the end of lines.
 
+Bitfield variables should be indented like this:
+
+	unsigned int foo :1;
+
+Do not put whitespace between any of the unary operators and their operand.
+
+It is usually unnecessary to have whitespace around parentheses as
+part of expressions, around brackets, or around the operators . and
+->.
 
 		Chapter 2: Breaking long lines and strings
 
@@ -403,7 +412,7 @@ int fun(int a)
 	int result = 0;
 	char *buffer = kmalloc(SIZE);
 
-	if (buffer == NULL)
+	if (!buffer)
 		return -ENOMEM;
 
 	if (condition1) {

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