auth-juniper: Check asprintf() return values
auth-juniper: Check asprintf() return values

This fixes a compile warning:

    auth-juniper.c: In function 'parse_input_node':
    auth-juniper.c:108:11: warning: ignoring return value of 'asprintf', declared with attribute warn_unused_result [-Wunused-result]
    auth-juniper.c:114:11: warning: ignoring return value of 'asprintf', declared with attribute warn_unused_result [-Wunused-result]

Signed-off-by: Kevin Cernekee <3105dbb3dd63fbb4f6371cfb04adc6726f76c56b@gmail.com>

lins05/openconnect,atyndall/openconnect,mtmiller/openconnect,lins05/openconnect,nmav/openconnect-mine,brandt/openconnect,atyndall/openconnect,mtmiller/openconnect,don-johnny/openconnect,mveplus/openconnect-client,don-johnny/openconnect,nmav/openconnect-mine,liiir1985/openconnect,cernekee/openconnect,mveplus/openconnect-client,atyndall/openconnect,don-johnny/openconnect,matlockx/openconnect,mtmiller/openconnect,don-johnny/openconnect,brandt/openconnect,matlockx/openconnect,matlockx/openconnect,mveplus/openconnect-client,cernekee/openconnect,liiir1985/openconnect,lins05/openconnect,cernekee/openconnect,brandt/openconnect,mveplus/openconnect-client,cernekee/openconnect,nmav/openconnect-mine,atyndall/openconnect,matlockx/openconnect,brandt/openconnect,mtmiller/openconnect,lins05/openconnect,liiir1985/openconnect,nmav/openconnect-mine,liiir1985/openconnect