CID 1467420: Dereference before null check in rtems_shell_line_editor().

Closes #4254
---
 cpukit/libmisc/shell/shell.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/cpukit/libmisc/shell/shell.c b/cpukit/libmisc/shell/shell.c
index 3c357a1..1e5962b 100644
--- a/cpukit/libmisc/shell/shell.c
+++ b/cpukit/libmisc/shell/shell.c
@@ -320,7 +320,10 @@ static int rtems_shell_line_editor(
   int          cmd = -1;
   int          inserting = 1;
   int          in_fileno = fileno(in);
-  int          out_fileno = fileno(out);
+  int          out_fileno;
+
+  _Assert(out != NULL);
+  out_fileno = fileno(out);
 
   /*
    * Only this task can use this file descriptor because calling
-- 
1.8.3.1

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