daemon.c: minor style fixup

daemon.c: minor style fixup

* "else" on the same line as "}" that closes corresponding "if (...) {";

 * multi-line comments begin with "/*\n";

 * sizeof, even it is not a function, is written as "sizeof(...)";

 * no need to check x?alloc() return value -- it would have died;

 * "if (...) { ... }" that covers the whole function body can be dedented
   by returning from the function early with "if (!...) return;";

 * SP on each side of an operator, i.e. "a > 0", not "a>0";

Also removes stale comment describing how remove_child() used to do its
thing.

Signed-off-by: Junio C Hamano <gitster@pobox.com>:
Signed-off-by: Junio C Hamano <gitster@pobox.com>