internal/pkg/exec: close early failure before wait

This avoids a deadlock on an early container failure.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/pkg/exec.go

@@ -631,12 +631,6 @@ func (a *execArtifact) cure(f *FContext, hostNet bool) (err error) {
 			_ = stdout.Close()
 			return
 		}
-		defer func() {
-			if err != nil && !errors.As(err, new(*exec.ExitError)) {
-				_ = stdout.Close()
-				_ = stderr.Close()
-			}
-		}()
 
 		brStdout, brStderr := f.cache.getReader(stdout), f.cache.getReader(stderr)
 		stdoutDone, stderrDone := make(chan struct{}), make(chan struct{})
@@ -651,6 +645,11 @@ func (a *execArtifact) cure(f *FContext, hostNet bool) (err error) {
 			io.TeeReader(brStderr, status),
 		)
 		defer func() {
+			if err != nil && !errors.As(err, new(*exec.ExitError)) {
+				_ = stdout.Close()
+				_ = stderr.Close()
+			}
+
 			<-stdoutDone
 			<-stderrDone
 			f.cache.putReader(brStdout)