test_suite_pem: fix comment in test case

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/suites/test_suite_pem.data b/tests/suites/test_suite_pem.data
index 53b8494..b5bcb40 100644
--- a/tests/suites/test_suite_pem.data
+++ b/tests/suites/test_suite_pem.data
@@ -78,7 +78,7 @@
 depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CBC
 mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,31323334353637380000000000000000\n\n5wA/XVXHuMsQAAOGFQmK0g==\n-----END EC PRIVATE KEY-----":"password":MBEDTLS_ERR_PEM_BAD_INPUT_DATA:""
 
-# Padding data (0x9) is larger than AES block size (8).
+# Padding data (0x9) is larger than DES block size (8).
 # Generated with:
 #   echo -n -e "\x68\x65\x6c\x6c\x6f\x09\x09\x09" | openssl des-cbc -e -base64 -p -K "bbb0ddff1b944b3cc68eaaeb7ac20099" -iv "3132333435363738" -nopad
 PEM read (DES-CBC, padding data is larger than DES block length)