fix: panic with defer inside for loop

[ldez]

$ sqlclosecheck ./...
panic: unreachable

goroutine 802 [running]:
go/types.(*comparer).identical(0x2413e9282af6, {0x866530?, 0xb31df0?}, {0x865e28?, 0x2413f1724080?}, 0x0)
        /usr/lib/go/src/go/types/predicates.go:497 +0x805
go/types.(*comparer).identical(0x2413e9282af6, {0x865e00?, 0xb31de0?}, {0x865e00?, 0x2413effb8e20?}, 0x0)
        /usr/lib/go/src/go/types/predicates.go:311 +0x6ff
go/types.Identical(...)
        /usr/lib/go/src/go/types/api_predicates.go:90
github.com/ryanrolds/sqlclosecheck/pkg/analyzer.getTargetTypesValues(0x2413effba880?, 0xb3bb20?, {0x2413edbb40c0, 0x3, 0x48341e?})
        sqlclosecheck/pkg/analyzer/defer_only.go:189 +0x1c5
github.com/ryanrolds/sqlclosecheck/pkg/analyzer.(*deferOnlyAnalyzer).Run(0x800200?, 0x2413ed9dbc00)
        sqlclosecheck/pkg/analyzer/defer_only.go:69 +0x19e
github.com/ryanrolds/sqlclosecheck/pkg/analyzer.run(0x7d78e0?)
        sqlclosecheck/pkg/analyzer/analyzer.go:19 +0x1b
golang.org/x/tools/go/analysis/checker.(*Action).execOnce.func3(...)
        sqlclosecheck/vendor/golang.org/x/tools/go/analysis/checker/checker.go:359
golang.org/x/tools/go/analysis/checker.(*Action).execOnce(0x2413f16a81e0)
        sqlclosecheck/vendor/golang.org/x/tools/go/analysis/checker/checker.go:380 +0xb9c
sync.(*Once).doSlow(0x2413f1a26900?, 0x6e1ee0?)
        /usr/lib/go/src/sync/once.go:78 +0xac
sync.(*Once).Do(...)
        /usr/lib/go/src/sync/once.go:69
golang.org/x/tools/go/analysis/checker.(*Action).exec(...)
        sqlclosecheck/vendor/golang.org/x/tools/go/analysis/checker/checker.go:258
golang.org/x/tools/go/analysis/checker.execAll.func1(0x2413ef7da798?)
        sqlclosecheck/vendor/golang.org/x/tools/go/analysis/checker/checker.go:246 +0x45
created by golang.org/x/tools/go/analysis/checker.execAll in goroutine 1
        sqlclosecheck/vendor/golang.org/x/tools/go/analysis/checker/checker.go:252 +0x147

Example

package main

import (
	"context"
	"database/sql"
	"fmt"
	"iter"
	"sync"
)

type db struct {
	mu      sync.Mutex
	remotes map[string]*sql.DB
}

func (db *db) All() iter.Seq2[string, *sql.DB] {
	return func(yield func(string, *sql.DB) bool) {
		db.mu.Lock()
		defer db.mu.Unlock()
		for addr, r := range db.remotes {
			if !yield(addr, r) {
				return
			}
		}
	}
}

func (db *db) Foo(ctx context.Context) error {
	for addr, rem := range db.All() {
		rconn, err := rem.Conn(context.Background())
		if err != nil {
			return err
		}
		defer rconn.Close()

		rows, err := rconn.QueryContext(ctx, `SELECT * FROM foo`)
		if err != nil {
			return err
		}
		defer rows.Close()
		for rows.Next() {
			fmt.Println(rows.ColumnTypes())
		}
		if err := rows.Err(); err != nil {
			return err
		}
		fmt.Println(addr, rconn.PingContext(context.Background()))
	}
	return nil
}

func main() {
	d := &db{remotes: make(map[string]*sql.DB)}
	fmt.Println(d.Foo(context.Background()))
}

Related to golangci/golangci-lint#6467