fix minor unreachable code caused by log.Fatal

[Abirdcfly]

https://pkg.go.dev/log#Fatalf

Fatalf is equivalent to Printf() followed by a call to os.Exit(1).

see https://go.dev/play/p/iw2MCkHArJZ for example:

package main

import "log"

func main() {
	log.Println("Println will print and not exit")
	log.Fatalf("Fatalf will print and exit")
	log.Println("this line cant reach")
}

/* output:
2009/11/10 23:00:00 Println will print and not exit
2009/11/10 23:00:00 Fatalf will print and exit

Program exited.
*/

---

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R: @lostluck R: @jrmccluskey (just found that you have recently reviewed the go code)

[Abirdcfly]

R: @lostluck

[Abirdcfly]

R: @jrmccluskey

[github-actions[bot]]

Stopping reviewer notifications for this pull request: review requested by someone other than the bot, ceding control

[codecov[bot]]

Codecov Report

Merging #22618 (83dd3c5) into master (17fb9c0) will decrease coverage by 0.00%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #22618      +/-   ##
==========================================
- Coverage   74.20%   74.20%   -0.01%     
==========================================
  Files         708      710       +2     
  Lines       93462    93547      +85     
==========================================
+ Hits        69355    69414      +59     
- Misses      22832    22856      +24     
- Partials     1275     1277       +2     

Flag	Coverage Δ
go	51.54% <ø> (+0.02%)	:arrow_up:
python	83.60% <ø> (-0.02%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
sdks/python/apache_beam/utils/interactive_utils.py	95.12% <0.00%> (-2.44%)	:arrow_down:
sdks/python/apache_beam/utils/subprocess_server.py	56.54% <0.00%> (-2.20%)	:arrow_down:
sdks/python/apache_beam/internal/metrics/metric.py	93.00% <0.00%> (-1.00%)	:arrow_down:
sdks/python/apache_beam/io/localfilesystem.py	90.97% <0.00%> (-0.76%)	:arrow_down:
...eam/runners/portability/fn_api_runner/execution.py	92.44% <0.00%> (-0.65%)	:arrow_down:
sdks/python/apache_beam/runners/direct/executor.py	96.46% <0.00%> (-0.55%)	:arrow_down:
sdks/python/apache_beam/transforms/combiners.py	93.05% <0.00%> (-0.39%)	:arrow_down:
sdks/python/apache_beam/coders/coders.py	88.00% <0.00%> (-0.35%)	:arrow_down:
...ks/python/apache_beam/runners/worker/sdk_worker.py	88.94% <0.00%> (-0.16%)	:arrow_down:
sdks/python/apache_beam/transforms/util.py	96.06% <0.00%> (-0.16%)	:arrow_down:
... and 16 more

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