In handle_body only read a line if we don't already have one.
In handle_body only read a line if we don't already have one.

This prepares for detecting non-email patches that don't have
mail headers.  In which case we have already read the first
line so handle_body should not ignore it.

Signed-off-by: Eric W. Biederman <8a741aa8cbd77ebc4a56ddb528ce9fd15d42f034@xmission.com>
Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git