fix typo in comment in tree-ssa-strlen.c

[Prathamesh Kulkarni]

Committed as obvious (r238588).

Thanks,
Prathamesh

Index: tree-ssa-strlen.c
===================================================================
--- tree-ssa-strlen.c   (revision 238587)
+++ tree-ssa-strlen.c   (working copy)
@@ -2383,7 +2383,7 @@
 };
 
 /* Callback for walk_dominator_tree.  Attempt to optimize various
-   string ops by remembering string lenths pointed by pointer SSA_NAMEs.  */
+   string ops by remembering string lengths pointed by pointer SSA_NAMEs.  */
 
 edge
 strlen_dom_walker::before_dom_children (basic_block bb)

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