of: base: Document prefix argument for of_get_next_child_with_prefix()

When of_get_next_child_with_prefix() was added, the prefix argument was
left undocumented. This caused a new warning to be generated during the
kerneldoc build process:

 drivers/of/base.c:661: warning: Function parameter or struct member 'prefix'
 	not described in 'of_get_next_child_with_prefix'

Properly document the argument to fix this.

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Fixes: 1fcc67e ("of: base: Add for_each_child_of_node_with_prefix()")
Signed-off-by: Chen-Yu Tsai <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

Author: wens

drivers/of/base.c

@@ -648,6 +648,7 @@ EXPORT_SYMBOL(of_get_next_child);
  * of_get_next_child_with_prefix - Find the next child node with prefix
  * @node:	parent node
  * @prev:	previous child of the parent node, or NULL to get first
+ * @prefix:	prefix that the node name should have
  *
  * This function is like of_get_next_child(), except that it automatically
  * skips any nodes whose name doesn't have the given prefix.