CODING: one-line if statements should not have braces

Update the style guide with a declaration of the prevailing and
preferred brace style for one-line if statements and loops. Provide an
example and counter-example.

Change-Id: Iafeea977203b76c0e67385779fb4ed57f3c6699a
Reviewed-on: https://gerrit.openafs.org/12370
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>

CODING

@@ -93,7 +93,29 @@ Example:
 	 * like this example.
 	 */
 
-
+Do not use braces on one-line if and loop statements.
+
+Use:
+
+	if (some_condition)
+	    do_some_action();
+	else
+	    do_something_else();
+
+	while (some_condition)
+	    do_something();
+
+Instead of:
+
+	if (some_condition) {
+	    do_some_action();
+	}
+
+	while (some_condition) {
+	    do_something();
+	}
+
+
 Dependencies required to build OpenAFS from source
 --------------------------------------------------
 The following packages are required to build all of the OpenAFS code