Fix the order of freeing memory

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/tests/suites/test_suite_bignum_mod.function b/tests/suites/test_suite_bignum_mod.function
index c19c2f4..4914e1d 100644
--- a/tests/suites/test_suite_bignum_mod.function
+++ b/tests/suites/test_suite_bignum_mod.function
@@ -181,13 +181,13 @@
     }
 
 exit:
-    mbedtls_mpi_mod_modulus_free( &m );
-
     mbedtls_free( rA.p );
     mbedtls_free( rB.p );
     mbedtls_free( rR.p );
     mbedtls_free( X );
     mbedtls_free( (mbedtls_mpi_uint *) m.p );
+
+    mbedtls_mpi_mod_modulus_free( &m );
 }
 /* END_CASE */
 
@@ -233,14 +233,14 @@
                 MBEDTLS_ERR_MPI_BAD_INPUT_DATA );
 
 exit:
-    mbedtls_mpi_mod_modulus_free( &m );
-    mbedtls_mpi_mod_modulus_free( &fake_m );
-
     mbedtls_free( rA.p );
     mbedtls_free( rB.p );
     mbedtls_free( rR.p );
     mbedtls_free( X );
     mbedtls_free( (mbedtls_mpi_uint *) m.p );
+
+    mbedtls_mpi_mod_modulus_free( &m );
+    mbedtls_mpi_mod_modulus_free( &fake_m );
 }
 /* END_CASE */