Fix for nested tag names with attributes bug

[jimenefe]

Fix for #373

[codecov-io]

Codecov Report

Merging #374 into master will increase coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #374      +/-   ##
==========================================
+ Coverage   87.51%   87.58%   +0.06%     
==========================================
  Files          14       14              
  Lines         737      741       +4     
  Branches       96       91       -5     
==========================================
+ Hits          645      649       +4     
  Misses         92       92

Impacted Files	Coverage Δ
...cala/com/databricks/spark/xml/XmlInputFormat.scala	93.38% <100%> (+0.22%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update a0a8b15...6b9ab13. Read the comment docs.

[srowen]

Looks good, yeah.
I think that char-at-a-time model here is getting pretty hard to maintain and get right (still doesn't handle commented-out rows) and later maybe we can rewrite the whole thing with a char buffer, marking readers, etc. But that's for later, and this is a fine clean fix.