Fix spelling typo
Fix return code in build()

When building a package that doesn't exist in the local pacman cache,
the build() function returns 1 as a result of the '[[ -f ...]]' being the
last executed instruction.

The patch fixes this by explicitly returning 0 if we reach the end of
the build function.
Merge pull request #7 from jasongraham/build-return-fix

Build function return fix