Variable name shadowing import symbol

From https://github.com/vlang/v/issues/17173 and https://github.com/vlang/v/pull/17197, variable should not shadow import symbol, there are several potential errors found in vinix:

[ ] modules/memory/mmap/mmap.v:268:6

266 | pub fn mmap(_pagemap &memory.Pagemap, addr voidptr, _length u64, prot int, flags int, _resource &resource.Resource, offset i64) ?voidptr {
267 |     mut pagemap := unsafe { _pagemap }
268 |     mut resource := unsafe { _resource }
  |         ~~~~~~~~
269 | 
270 |     if _length == 0 {

[ ] modules/file/epoll.v:209:7

207 |         }
208 | 
209 |         mut event := unsafe { &ret_events[i] }
  |             ~~~~~
210 | 
211 |         mut fd := fd_from_fdnum(unsafe { nil }, fdnum) or {

[ ] modules/file/epoll.v:218:7

216 |         }
217 | 
218 |         mut resource := fd.handle.resource
  |             ~~~~~~~~
219 | 
220 |         status := resource.status

[ ] modules/file/epoll.v:244:7

242 | 
243 |         mut epoll_event := unsafe { &epoll_events[which] }
244 |         mut event := unsafe { &ret_events[0] }
  |             ~~~~~
245 | 
246 |         if u32(status) & epoll_event.events != 0 {

[ ] modules/file/file.v:118:7

116 |         }
117 | 
118 |         mut resource := fd.handle.resource
  |             ~~~~~~~~
119 | 
120 |         status := resource.status

[ ] modules/file/file.v:449:6

447 |     }
448 | 
449 |     mut resource := &resource.Resource(unsafe { nil })
  |         ~~~~~~~~
450 |     mut fd := &FD(0)
451 |

vlang / vinix

Variable name shadowing import symbol #113