Update SelectSSH.cmake

Author: lrm29

cmake/SelectSSH.cmake

@@ -33,5 +33,5 @@ elseif(USE_SSH STREQUAL ON OR USE_SSH STREQUAL "libssh2")
 elseif(USE_SSH STREQUAL OFF OR USE_SSH STREQUAL "")
 	add_feature_info(SSH OFF "SSH transport support")
 else()
-	message(FATAL_ERROR "unknown SSH option: ${USE_HTTP_PARSER}")
+	message(FATAL_ERROR "unknown SSH option: ${USE_SSH}")
 endif()