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

mailinfo.c

@@ -724,7 +724,7 @@ static void handle_body(void)
 {
 	int seen = 0;
 
-	if (fgets(line, sizeof(line), stdin) != NULL) {
+	if (line[0] || fgets(line, sizeof(line), stdin) != NULL) {
 		handle_commit_msg(&seen);
 		handle_patch();
 	}