doc: replace @return by Return:

Sphinx expects Return: and not @return to indicate a return value.

find . -name '*.c' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

find . -name '*.h' -exec \
sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \;

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
diff --git a/cmd/tpm-common.c b/cmd/tpm-common.c
index 1d5442c..47adaff 100644
--- a/cmd/tpm-common.c
+++ b/cmd/tpm-common.c
@@ -46,7 +46,7 @@
  *			NULL is passed, a large enough buffer will be allocated,
  *			and the caller must free it.
  * @param count_ptr	output variable for the length of byte string
- * @return pointer to output buffer
+ * Return: pointer to output buffer
  */
 void *parse_byte_string(char *bytes, u8 *data, size_t *count_ptr)
 {
@@ -81,7 +81,7 @@
  * report_return_code() - Report any error and return failure or success
  *
  * @param return_code	TPM command return code
- * @return value of enum command_ret_t
+ * Return: value of enum command_ret_t
  */
 int report_return_code(int return_code)
 {
@@ -97,7 +97,7 @@
  * Return number of values defined by a type string.
  *
  * @param type_str	type string
- * @return number of values of type string
+ * Return: number of values of type string
  */
 int type_string_get_num_values(const char *type_str)
 {
@@ -108,7 +108,7 @@
  * Return total size of values defined by a type string.
  *
  * @param type_str	type string
- * @return total size of values of type string, or 0 if type string
+ * Return: total size of values of type string, or 0 if type string
  *  contains illegal type character.
  */
 size_t type_string_get_space_size(const char *type_str)
@@ -140,7 +140,7 @@
  *
  * @param type_str	type string
  * @param count		pointer for storing size of buffer
- * @return pointer to buffer or NULL on error
+ * Return: pointer to buffer or NULL on error
  */
 void *type_string_alloc(const char *type_str, u32 *count)
 {
@@ -164,7 +164,7 @@
  * @param type_str	type string
  * @param values	text strings of values to be packed
  * @param data		output buffer of values
- * @return 0 on success, non-0 on error
+ * Return: 0 on success, non-0 on error
  */
 int type_string_pack(const char *type_str, char * const values[],
 		     u8 *data)
@@ -202,7 +202,7 @@
  * @param type_str	type string
  * @param data		input buffer of values
  * @param vars		names of environment variables
- * @return 0 on success, non-0 on error
+ * Return: 0 on success, non-0 on error
  */
 int type_string_write_vars(const char *type_str, u8 *data,
 			   char * const vars[])