crush/builder.c: remove some unreachable return statements

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
msg: fix some -Wextra-semi warnings

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>
remove superfluous second semicolons at end of lines

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>