Change goto exit into direct return

Fix errors in merge conflict resolution - change
psa_generate_random_internal() to return directly rather than jumping to
an exit label and restore the variable psa_status_t status.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 089751a..9b22348 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -4159,20 +4159,20 @@
 
 #if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
 
+    psa_status_t status;
     size_t output_length = 0;
     status = mbedtls_psa_external_get_random(&global_data.rng,
                                              output, output_size,
                                              &output_length);
     if (status != PSA_SUCCESS) {
-        goto exit;
+        return status;
     }
     /* Breaking up a request into smaller chunks is currently not supported
      * for the external RNG interface. */
     if (output_length != output_size) {
-        status = PSA_ERROR_INSUFFICIENT_ENTROPY;
-        goto exit;
+        return PSA_ERROR_INSUFFICIENT_ENTROPY;
     }
-    status = PSA_SUCCESS;
+    return PSA_SUCCESS;
 
 #else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */