RTEMS | cpukit/stringto: add null check for input string in stringto* methods (!929)

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/929#note_142031


Formatting needs to be fixed. I'll share some instructions soon, but here's the correct way for this diff:
```
diff --git a/testsuites/libtests/stringto01/stringto_test_template.h b/testsuites/libtests/stringto01/stringto_test_template.h
index 460635db7e..3d12f1492c 100644
--- a/testsuites/libtests/stringto01/stringto_test_template.h
+++ b/testsuites/libtests/stringto01/stringto_test_template.h
@@ -55,14 +55,17 @@ void TEST_STRING_TO_NAME( void )
 
   /* Null pointer for input string */
   puts(
-    STRING_TO_NAME_METHOD_STRING
-    " - NULL input string - RTEMS_INVALID_ADDRESS"
+    STRING_TO_NAME_METHOD_STRING " - NULL input string - RTEMS_INVALID_ADDRESS"
   );
-  #if defined(STRING_TO_INTEGER)
-    status = STRING_TO_NAME_METHOD( NULL, &value, &endptr,
-        get_base_10_or_16( GOOD_VALUE_STRING ) );
-  #elif defined(STRING_TO_POINTER) || defined(STRING_TO_FLOAT)
-    status = STRING_TO_NAME_METHOD( NULL, &value, &endptr );
+  #if defined( STRING_TO_INTEGER )
+  status = STRING_TO_NAME_METHOD(
+    NULL,
+    &value,
+    &endptr,
+    get_base_10_or_16( GOOD_VALUE_STRING )
+  );
+  #elif defined( STRING_TO_POINTER ) || defined( STRING_TO_FLOAT )
+  status = STRING_TO_NAME_METHOD( NULL, &value, &endptr );
   #endif
   rtems_test_assert( status == RTEMS_INVALID_ADDRESS );
 
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/929#note_142031
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