Fix potential not initialized warning

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/tests/suites/test_suite_bignum_mod_raw.function b/tests/suites/test_suite_bignum_mod_raw.function
index 22a73e0..aaf26ca 100644
--- a/tests/suites/test_suite_bignum_mod_raw.function
+++ b/tests/suites/test_suite_bignum_mod_raw.function
@@ -291,6 +291,9 @@
     size_t limbs_N;
     size_t limbs_res;
 
+    mbedtls_mpi_mod_modulus m;
+    mbedtls_mpi_mod_modulus_init( &m );
+
     TEST_EQUAL( mbedtls_test_read_mpi_core( &A,   &limbs_A,   input_A ), 0 );
     TEST_EQUAL( mbedtls_test_read_mpi_core( &B,   &limbs_B,   input_B ), 0 );
     TEST_EQUAL( mbedtls_test_read_mpi_core( &N,   &limbs_N,   input_N ), 0 );
@@ -305,9 +308,6 @@
 
     ASSERT_ALLOC( X, limbs );
 
-    mbedtls_mpi_mod_modulus m;
-    mbedtls_mpi_mod_modulus_init( &m );
-
     TEST_EQUAL( mbedtls_mpi_mod_modulus_setup(
                         &m, N, limbs,
                         MBEDTLS_MPI_MOD_EXT_REP_BE,