cvsimport: style fixup.

This should not change any functionality, but just makes it readable by
having a space between syntactic construct keyword and open parenthesis
(e.g. "if (expr", not "if(expr") and between close parenthesis and open
brace (e.g. "if (expr) {" not "if (expr){").

Signed-off-by: Junio C Hamano <junkio@cox.net>