[sysprof] line-reader: handle invalid parameters more gracefully

[Christian Hergert <chergert src gnome org>]

commit e4e1bf73b36b17230104544e73b686fd6635d2de
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 22 11:02:03 2016 -0700

    line-reader: handle invalid parameters more gracefully
    
    This silences coverity which doesn't handle return_if_fail() macros
    very well.

 lib/sp-line-reader.c |   26 ++++++++++----------------
 1 files changed, 10 insertions(+), 16 deletions(-)
---
diff --git a/lib/sp-line-reader.c b/lib/sp-line-reader.c
index 174ed98..35c8814 100644
--- a/lib/sp-line-reader.c
+++ b/lib/sp-line-reader.c
@@ -51,28 +51,22 @@ SpLineReader *
 sp_line_reader_new (const gchar *contents,
                     gssize       length)
 {
-  SpLineReader *self;
+  SpLineReader *self = g_slice_new (SpLineReader);
 
-  g_return_val_if_fail (contents != NULL, NULL);
-
-  self = g_slice_new (SpLineReader);
-
-  if (length < 0)
-    length = strlen (contents);
-
-  if (contents != NULL)
+  if (contents == NULL)
     {
-      self->contents = contents;
-      self->length = length;
-      self->pos = 0;
+      contents = "";
+      length = 0;
     }
-  else
+  else if (length < 0)
     {
-      self->contents = NULL;
-      self->length = 0;
-      self->pos = 0;
+      length = strlen (contents);
     }
 
+  self->contents = contents;
+  self->length = length;
+  self->pos = 0;
+
   return self;
 }