Add new return code: LAM_ERR_IN_ERRNO

This commit was SVN r252.

src/lam/constants.h

@@ -20,7 +20,8 @@ enum {
     LAM_ERR_NOT_IMPLEMENTED = -10,
     LAM_ERR_NOT_SUPPORTED = -11,
     LAM_ERR_INTERUPTED = -12,
-    LAM_ERR_WOULD_BLOCK = -13
+    LAM_ERR_WOULD_BLOCK = -13,
+    LAM_ERR_IN_ERRNO = -14
 };
 
 #endif /* LAM_CONSTANTS_H */