Build fix - remove line of dead code

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/tests/suites/test_suite_ecdsa.function b/tests/suites/test_suite_ecdsa.function
index a58b1f8..bc67e35 100644
--- a/tests/suites/test_suite_ecdsa.function
+++ b/tests/suites/test_suite_ecdsa.function
@@ -681,7 +681,6 @@
 {
     mbedtls_ecdsa_context ctx;
     mbedtls_mpi sig_r, sig_s;
-    const mbedtls_ecp_curve_info *curve_info;
 
     mbedtls_ecdsa_init( &ctx );
     mbedtls_mpi_init( &sig_r );