pk: fix a return value and a typo in comment

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index 3a5543a..ffd1b73 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -282,7 +282,7 @@
      * - the following fields are used for all public key operations: signature
      *   verify, key pair check and key write.
      * Of course, when MBEDTLS_PK_USE_PSA_EC_DATA is not enabled, the legacy
-     * ecp_keypair structure is used for storing the public key and perform
+     * ecp_keypair structure is used for storing the public key and performing
      * all the operations.
      *
      * Note: This new public key storing solution only works for EC keys, not
diff --git a/library/pkparse.c b/library/pkparse.c
index d47b099..9bc8801 100644
--- a/library/pkparse.c
+++ b/library/pkparse.c
@@ -722,7 +722,7 @@
     } else {
         /* Uncompressed format */
         if ((end - *p) > MBEDTLS_PK_MAX_EC_PUBKEY_RAW_LEN) {
-            return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
+            return MBEDTLS_ERR_PK_BUFFER_TOO_SMALL;
         }
         memcpy(pk->pub_raw, *p, (end - *p));
         pk->pub_raw_len = end - *p;