Fix lineno offset in show_skipped

The line number is 0-based here, so add 1.

_pytest/skipping.py

@@ -382,4 +382,4 @@ def show_skipped(terminalreporter, lines):
                     reason = reason[9:]
                 lines.append(
                     "SKIP [%d] %s:%d: %s" %
-                    (num, fspath, lineno, reason))
+                    (num, fspath, lineno + 1, reason))

changelog/2548.bugfix

@@ -0,0 +1 @@
+Fix lineno offset in show_skipped.

testing/test_skipping.py

@@ -708,7 +708,7 @@ def test_skipped_reasons_functional(testdir):
     )
     result = testdir.runpytest('-rs')
     result.stdout.fnmatch_lines([
-        "*SKIP*2*conftest.py:3: test",
+        "*SKIP*2*conftest.py:4: test",
     ])
     assert result.ret == 0