Why don't these figures align horizontally?

Question

I am trying to use the subcaption package for horizontally aligning up some figures, and I did as the documentation instructs me to do, yet the result is these are vertically aligned. It really confuses me.

\documentclass{article}

\usepackage[font=small]{caption}
\usepackage{subcaption}
\usepackage{graphicx}
\usepackage{xltxtra}
\usepackage{fontspec}


\setmainfont[Ligatures=TeX]{Linux Libertine O}

\begin{document}
\begin{figure}[htp]

    \centering
    \begin{minipage}[t]{0.3\linewidth}
        \includegraphics[width=\linewidth]{fig/bed1.jpg}
        \subcaption{Bedroom 1}
    \end{minipage}

    \begin{minipage}[t]{0.3\linewidth}
        \includegraphics[width=\linewidth]{fig/bed2.jpg}
        \subcaption{Bedroom 2}
    \end{minipage}
    \caption{Two bedrooms}

\end{figure}
\end{document}

Answer 1

The second minipage is moved onto a new line because you have an extra line between the first \end{minipage} and the second \begin{minipage}. Check the documentation here http://mirror.ctan.org/macros/latex/contrib/caption/subcaption.pdf and you'll see the missing newline in the example. The following MWE will put them on the same line:

\documentclass{article}
\usepackage[font=small]{caption}
\usepackage{subcaption}
\usepackage{graphicx}
\begin{document}
\begin{figure}[htp]
    \centering
    \begin{minipage}[t]{0.3\linewidth}
        \includegraphics[width=\linewidth]{fig/bed1}
        \subcaption{Bedroom 1}
    \end{minipage}%
    \begin{minipage}[t]{0.3\linewidth}
        \includegraphics[width=\linewidth]{fig/bed2}
        \subcaption{Bedroom 2}
    \end{minipage}
    \caption{Two bedrooms}
\end{figure}
\end{document}

Answer 2

darthbith's answer is partially right, here is how I solved it:

1. remove the \centering line in the figure environment
2. remove the superfluous newline as darthbith suggested.