storage: return -1 when fs pool can't be mounted
Don't reuse the return value of virStorageBackendFileSystemIsMounted. If it's 0, we'd return it even if the mount command failed. Also, don't report another error if it's -1, since one has already been reported. Introduced by 258e06c8. https://bugzilla.redhat.com/show_bug.cgi?id=981251
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