[njs] Fixed typo in njs_string_prototype_pad().

[Dmitry Volyntsev]

details:   https://hg.nginx.org/njs/rev/f98304d4019b
branches:  
changeset: 1250:f98304d4019b
user:      Artem S. Povalyukhin <artem.povaluhin at gmail.com>
date:      Fri Nov 22 11:02:55 2019 +0300
description:
Fixed typo in njs_string_prototype_pad().

The typo was introduced in 47cdd4680fc2.

This closes #253 issue on Github.

diffstat:

 src/njs_string.c         |  2 +-
 src/test/njs_unit_test.c |  6 ++++++
 2 files changed, 7 insertions(+), 1 deletions(-)

diffs (35 lines):

diff -r 37f1f20de909 -r f98304d4019b src/njs_string.c
--- a/src/njs_string.c	Thu Nov 21 22:31:14 2019 +0300
+++ b/src/njs_string.c	Fri Nov 22 11:02:55 2019 +0300
@@ -2939,7 +2939,7 @@ njs_string_prototype_pad(njs_vm_t *vm, n
         } else {
             ret = njs_value_to_string(vm, pad, pad);
             if (njs_slow_path(ret != NJS_OK)) {
-                return NJS_OK;
+                return NJS_ERROR;
             }
         }
     }
diff -r 37f1f20de909 -r f98304d4019b src/test/njs_unit_test.c
--- a/src/test/njs_unit_test.c	Thu Nov 21 22:31:14 2019 +0300
+++ b/src/test/njs_unit_test.c	Fri Nov 22 11:02:55 2019 +0300
@@ -6964,6 +6964,9 @@ static njs_unit_test_t  njs_test[] =
     { njs_str("'абв'.padStart(10, 'эю')"),
       njs_str("эюэюэюэабв") },
 
+    { njs_str("'abc'.padStart(10, Symbol())"),
+      njs_str("TypeError: Cannot convert a Symbol value to a string") },
+
     { njs_str("'1234'.padEnd(4)"),
       njs_str("1234") },
 
@@ -7012,6 +7015,9 @@ static njs_unit_test_t  njs_test[] =
     { njs_str("'абвг'.padEnd(10, 'ДЕЖЗ')"),
       njs_str("абвгДЕЖЗДЕ") },
 
+    { njs_str("'abc'.padEnd(10, Symbol())"),
+      njs_str("TypeError: Cannot convert a Symbol value to a string") },
+
     { njs_str("String.bytesFrom({})"),
       njs_str("TypeError: value must be a string or array") },