Remove stray print statement (#4168)

Change `f did not decode` print statement to a log.

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---

#### Does this PR need a docs update or release note?

- [ ] ✅ Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x] ⛔ No

#### Type of change

<!--- Please check the type of change your PR introduces: --->
- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [ ] 💻 CI/Deployment
- [x] 🧹 Tech Debt/Cleanup

#### Issue(s)

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* #<issue>

#### Test Plan

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- [ ] 💪 Manual
- [ ] ⚡ Unit test
- [ ] 💚 E2E

src/internal/kopia/upload.go

@@ -5,7 +5,6 @@ import (
 	"context"
 	"encoding/base64"
 	"encoding/binary"
-	"fmt"
 	"io"
 	"os"
 	"runtime/trace"
@@ -249,11 +248,13 @@ func (cp *corsoProgress) FinishedHashingFile(fname string, bs int64) {
 	for i := range sl {
 		rdt, err := base64.StdEncoding.DecodeString(sl[i])
 		if err != nil {
-			fmt.Println("f did not decode")
+			logger.Ctx(cp.ctx).Infow(
-		}
+				"unable to decode base64 path segment",
-
+				"segment", sl[i])
+		} else {
 			sl[i] = string(rdt)
 		}
+	}
 
 	logger.Ctx(cp.ctx).Debugw(
 		"finished hashing file",