test/ipsec: fix build with GCC 12

[ upstream commit 250cbb8d5dd2ffcb4c8a871332f9ec8e5a59242f ]

GCC-12 raises following warning:

In function '_mm_loadu_si128',
    inlined from 'rte_mov16' at
	../lib/eal/x86/include/rte_memcpy.h:507:9,
    inlined from 'rte_mov128' at
	../lib/eal/x86/include/rte_memcpy.h:549:2,
    inlined from 'rte_memcpy_generic' at
	../lib/eal/x86/include/rte_memcpy.h:732:4,
    inlined from 'rte_memcpy' at
	../lib/eal/x86/include/rte_memcpy.h:882:10,
    inlined from 'setup_test_string_tunneled' at
	../app/test/test_ipsec.c:617:3:
/usr/lib/gcc/x86_64-pc-linux-gnu/12.1.1/include/emmintrin.h:703:10: error:
    array subscript '__m128i_u[15]' is partly outside array bounds of
    'const uint8_t[255]' {aka 'const unsigned char[255]'}
    [-Werror=array-bounds]
  703 |   return *__P;
      |          ^~~~
../app/test/test_ipsec.c: In function 'setup_test_string_tunneled':
../app/test/test_ipsec.c:491:22: note: at offset 240 into object
     'esp_pad_bytes' of size 255
  491 | static const uint8_t esp_pad_bytes[IPSEC_MAX_PAD_SIZE] = {

This patch restrict the copy to minimum size.

Fixes: 05fe65e ("test/ipsec: introduce functional test")

Signed-off-by: Amit Prakash Shukla <amitprakashs@marvell.com>
Acked-by: Akhil Goyal <gakhil@marvell.com>

app/test/test_ipsec.c

@@ -619,7 +619,8 @@ setup_test_string_tunneled(struct rte_mempool *mpool, const char *string,
 		rte_memcpy(dst, string, len);
 		dst += len;
 		/* copy pad bytes */
-		rte_memcpy(dst, esp_pad_bytes, padlen);
+		rte_memcpy(dst, esp_pad_bytes, RTE_MIN(padlen,
+			sizeof(esp_pad_bytes)));
 		dst += padlen;
 		/* copy ESP tail header */
 		rte_memcpy(dst, &espt, sizeof(espt));