misc: vmw_balloon: Remove braces to fix build for clang.

Based on a patch from: PaX Team <pageexec at freemail.hu> in a mailing
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	http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120507/142707.html



Clang chokes on the notation "inl (%dx)" but works for "inl %dx"; GNU as accepts both forms.

CC: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Jan-Simon Möller <dl9pf@gmx.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>