Remove redundant nil check in WalkGitLog (#26773)

From the Go specification:

> "1. For a nil slice, the number of iterations is 0."
https://go.dev/ref/spec#For_range

Therefore, an additional nil check for before the loop is unnecessary.

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

modules/git/log_name_status.go

@@ -374,7 +374,6 @@ heaploop:
 			break heaploop
 		}
 		parentRemaining.Remove(current.CommitID)
-		if current.Paths != nil {
 		for i, found := range current.Paths {
 			if !found {
 				continue
@@ -397,7 +396,6 @@ heaploop:
 				}
 			}
 		}
-		}
 
 		if remaining <= 0 {
 			break heaploop