all.bash: fail on misspells

all.bash will now fail if misspell fails.

Change-Id: Ida72c27469bef5f4b2a48f80221e925df6b2936d
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/296630
Trust: Julie Qiu <julie@golang.org>
Run-TryBot: Julie Qiu <julie@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
diff --git a/all.bash b/all.bash
index 6c80c50..39c3718 100755
--- a/all.bash
+++ b/all.bash
@@ -151,7 +151,7 @@
 # check_misspell runs misspell on source files.
 check_misspell() {
   ensure_go_binary github.com/client9/misspell/cmd/misspell
-  runcmd misspell cmd/**/*.{go,sh} internal/**/* README.md | warnout
+  runcmd misspell cmd/**/*.{go,sh} internal/**/* README.md
 }
 
 # check_templates runs go-template-lint on template files. Unfortunately it