addres lock release API comment

src/rp2_common/pico_mbedtls/pico_mbedtls.c

@@ -36,9 +36,7 @@ void mbedtls_sha256_init(__unused mbedtls_sha256_context *ctx) {
 }
 
 void mbedtls_sha256_free(__unused mbedtls_sha256_context *ctx) {
-    if (ctx->locked) {
-        pico_sha256_unlock(ctx);
-    }
+    pico_sha256_cleanup(ctx);
 }
 
 int mbedtls_sha256_starts_ret(mbedtls_sha256_context *ctx, int is224) {

src/rp2_common/pico_sha256/include/pico/sha256.h

@@ -58,15 +58,15 @@ typedef struct pico_sha256_state {
     size_t total_data_size;
 } pico_sha256_state_t;
 
-/*! \brief Release the internal lock on the SHA256 hardware
+/*! \brief Release the internal lock on the SHA-256 hardware
  *  \ingroup pico_sha256
  *
- * Release the internal lock on the hardware.
+ * Release the internal lock on the SHA-256 hardware.
  * Fails if the internal lock was not claimed.
  *
  * @param state A pointer to a pico_sha256_state_t instance
  */
-void __weak pico_sha256_unlock(pico_sha256_state_t *state);
+void pico_sha256_cleanup(pico_sha256_state_t *state);
 
 /*! \brief Start a SHA-256 calculation returning immediately with an error if the SHA-256 hardware is not available
  *  \ingroup pico_sha256

src/rp2_common/pico_sha256/sha256.c

@@ -30,6 +30,12 @@ void __weak pico_sha256_unlock(pico_sha256_state_t *state) {
     state->locked = false;
 }
 
+void pico_sha256_cleanup(pico_sha256_state_t *state) {
+    if (state->locked) {
+        pico_sha256_unlock(state);
+    }
+}
+
 int pico_sha256_try_start(pico_sha256_state_t *state, enum sha256_endianness endianness, bool use_dma) {
     memset(state, 0, sizeof(*state));
     if (!pico_sha256_lock(state)) return PICO_ERROR_RESOURCE_IN_USE;