/in/foo.c: In function 'FindMaxNeg':
/in/foo.c:24:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(i=i0+1;i<n;i++)
  ^~~
/in/foo.c:27:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
   return max;
   ^~~~~~
/in/foo.c:20:8: warning: 'i0' may be used uninitialized in this function [-Wmaybe-uninitialized]
  int i,i0,max;
        ^~