changelog: fixed typos

Signed-off-by: Valerio Setti <vsetti@baylibre.com>
diff --git a/library/x509write_crt.c b/library/x509write_crt.c
index 55f22d7..0fd307c 100644
--- a/library/x509write_crt.c
+++ b/library/x509write_crt.c
@@ -119,7 +119,7 @@
                         MBEDTLS_X509_RFC5280_MAX_SERIAL_LEN );
     if( ret < 0 )
         return ret;
-    
+
     /* Copy data to the internal structure skipping leading zeros */
     memcpy(ctx->serial, &tmp[MBEDTLS_X509_RFC5280_MAX_SERIAL_LEN - tmp_len],
             tmp_len);