test/efd: fix build with clang 15

[ upstream commit 94ec062953778f986af4261c7f6eb31af7c84202 ]

This local variable hides the more global one.
The original intent was probably to use the global one.

Fixes: 0e925ae ("app/test: add EFD functional and perf tests")

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Tyler Retzlaff <roretzla@linux.microsoft.com>

app/test/test_efd_perf.c

@@ -143,7 +143,6 @@ setup_keys_and_data(struct efd_perf_params *params, unsigned int cycle)
 		qsort(keys, KEYS_TO_ADD, MAX_KEYSIZE, key_compare);
 
 		/* Sift through the list of keys and look for duplicates */
-		int num_duplicates = 0;
 		for (i = 0; i < KEYS_TO_ADD - 1; i++) {
 			if (memcmp(keys[i], keys[i + 1], params->key_size) == 0) {
 				/* This key already exists, try again */