Exec returns wrong arg count in "not enough args" error

[semihbkgr]

db.Exec and db.Query share the same multi-statement loop and trip the same "not enough args" check, but the error messages disagree on the second number.

Repro

_, errExec := db.Exec("SELECT ?; SELECT ?", "hello")
_, errQuery := db.Query("SELECT ?; SELECT ?", "hello")
fmt.Println(errExec)
fmt.Println(errQuery)

Output:

not enough args to execute query: want 1 got 1
not enough args to execute query: want 1 got 0

The two paths use the same check len(args)-start < na but format different numbers in the error.