HEAD detached at pull/5404/merge

[fft]

Hi team's
I meet a strange cibuild problem when i do a PR to enable sparc's daily ci in 
tools/ci/testlist/other.dat, the build of xx3803/nsh seem's succed,but when 
Normalize xx3803/nsh,there is a:"HEAD detached at pull/5404/merge" I'm 
confused,and who can remind me why this result? thanks!
https://github.com/apache/incubator-nuttx/runs/5049376192?check_suite_focus=true


     Configuration/Tool: xx3803/nsh             

     
------------------------------------------------------------------------------------
    
 
        

       Cleaning...    
 
        

       Configuring...    
 
        

       Building NuttX...    
 
        

       Normalize xx3803/nsh    
 
        

     HEAD detached at pull/5404/merge    
 
        

     Untracked files:    
 
        

       (use "git add <file&gt;..." to include in what will be committed)    
 
        

        arch/sparc/include/board    
 
        

        arch/sparc/include/chip    
 
        

        arch/sparc/src/board    
 
        

        arch/sparc/src/chip    
 
        

         
 
        

     nothing added to commit but untracked files present (use "git add" to 
track)


Best regards,
Zou