Unlock mutex before returning from function

mapMutex is initialized in the ContainerRm function and cannot be released from outside,
thus unlock mutex before returning from function.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Егор Макрушин <[email protected]>

pkg/domain/infra/abi/containers.go

@@ -467,6 +467,7 @@ func (ic *ContainerEngine) ContainerRm(ctx context.Context, namesOrIds []string,
 	errMap, err := parallelctr.ContainerOp(ctx, libpodContainers, func(c *libpod.Container) error {
 		mapMutex.Lock()
 		if _, ok := ctrsMap[c.ID()]; ok {
+			mapMutex.Unlock()
 			return nil
 		}
 		mapMutex.Unlock()