sys/tsrb: fix some style and linter complains

Author: kfessel

sys/include/tsrb.h

@@ -33,7 +33,7 @@ extern "C" {
 #endif
 
 /**
- * @brief     thread-safe ringbuffer struct
+ * @brief       thread-safe ringbuffer struct
  */
 typedef struct tsrb {
     uint8_t *buf;               /**< Buffer to operate on. */
@@ -43,22 +43,22 @@ typedef struct tsrb {
 } tsrb_t;
 
 /**
- * @brief Static initializer
+ * @brief       Static initializer
  *
  * @note The size of the buffer (`sizeof(@p BUF)`) must be a power of two.
  *
- * @param[in] BUF       Buffer to use by tsrb.
+ * @param[in]   BUF       Buffer to use by tsrb.
  */
 #define TSRB_INIT(BUF) { (BUF), sizeof (BUF), 0, 0 }
 
 /**
- * @brief        Initialize a tsrb.
+ * @brief       Initialize a tsrb.
  *
  * @note The size of the buffer (@p bufsize) must be a power of two.
  *
- * @param[out]   rb        Datum to initialize.
- * @param[in]    buffer    Buffer to use by tsrb.
- * @param[in]    bufsize   Size of @p buffer.
+ * @param[out]  rb        Datum to initialize.
+ * @param[in]   buffer    Buffer to use by tsrb.
+ * @param[in]   bufsize   Size of @p buffer.
  */
 static inline void tsrb_init(tsrb_t *rb, uint8_t *buffer, unsigned bufsize)
 {
@@ -74,8 +74,8 @@ static inline void tsrb_init(tsrb_t *rb, uint8_t *buffer, unsigned bufsize)
 }
 
 /**
- * @brief        Clear a tsrb.
- * @param[out]   rb Ringbuffer to operate on
+ * @brief       Clear a tsrb.
+ * @param[out]  rb Ringbuffer to operate on
  */
 static inline void tsrb_clear(tsrb_t *rb)
 {
@@ -106,7 +106,7 @@ static inline int tsrb_empty(const tsrb_t *rb)
 static inline unsigned int tsrb_avail(const tsrb_t *rb)
 {
     unsigned irq_state = irq_disable();
-    int retval = (rb->writes - rb->reads);
+    unsigned int retval = (rb->writes - rb->reads);
     irq_restore(irq_state);
     return retval;
 }
@@ -133,7 +133,7 @@ static inline int tsrb_full(const tsrb_t *rb)
 static inline unsigned int tsrb_free(const tsrb_t *rb)
 {
     unsigned irq_state = irq_disable();
-    int retval = (rb->size - rb->writes + rb->reads);
+    unsigned int retval = (rb->size - rb->writes + rb->reads);
     irq_restore(irq_state);
     return retval;
 }