lt_dlerror returns "unknown error" instead of NULL

[Scott James Remnant]

Debian Bug#157229

lt_dlerror() is documented as returning NULL if no error
has occurred.  However the implementation actually returns
the string "unknown error".

Nothing seems to rely on this doc-broken behaviour, so I suggest
correcting lt_dlerror() to return NULL as the documentation says rather
than correcting the documentation :o)


Index: libltdl/ltdl.c
===================================================================
--- libltdl/ltdl.c      (revision 46)
+++ libltdl/ltdl.c      (working copy)
@@ -3924,7 +3924,7 @@
   LT_DLMUTEX_GETERROR (error);
   LT_DLMUTEX_SETERROR (0);
  
-  return error ? error : LT_DLSTRERROR (UNKNOWN);
+  return error ? error : NULL;
 }
  
 static int

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