aria: remove leftover in comments

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/aria.c b/library/aria.c
index a4d6c50..d9f84cc 100644
--- a/library/aria.c
+++ b/library/aria.c
@@ -578,8 +578,7 @@
     n = *iv_off;
 
     /* An overly large value of n can lead to an unlimited
-     * buffer overflow. Therefore, guard against this
-     * outside of parameter validation. */
+     * buffer overflow. */
     if (n >= MBEDTLS_ARIA_BLOCKSIZE) {
         return MBEDTLS_ERR_ARIA_BAD_INPUT_DATA;
     }
@@ -631,8 +630,7 @@
 
     n = *nc_off;
     /* An overly large value of n can lead to an unlimited
-     * buffer overflow. Therefore, guard against this
-     * outside of parameter validation. */
+     * buffer overflow. */
     if (n >= MBEDTLS_ARIA_BLOCKSIZE) {
         return MBEDTLS_ERR_ARIA_BAD_INPUT_DATA;
     }