blame: make sure that the last line ends in an LF

This is convenient when parsing multiple the blame of multiple files,
for example:

    git ls-files -z --exclude-standard -- "*.[ch]" |
    xargs --null -n 1 git blame -p > output

and then analyzing the 'output' file using a seperate script.

Currently the parsing is difficult when not all files have a newline
at EOF, this patch ensures that even such files have a newline at the
end of the blame output.

Signed-off-by: Sverre Rabbelier <srabbelier@gmail.com>
CC: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-blame.c

@@ -1604,6 +1604,9 @@ static void emit_porcelain(struct scoreboard *sb, struct blame_entry *ent)
 		} while (ch != '\n' &&
 			 cp < sb->final_buf + sb->final_buf_size);
 	}
+
+	if (sb->final_buf_size && cp[-1] != '\n')
+		putchar('\n');
 }
 
 static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
@@ -1667,6 +1670,9 @@ static void emit_other(struct scoreboard *sb, struct blame_entry *ent, int opt)
 		} while (ch != '\n' &&
 			 cp < sb->final_buf + sb->final_buf_size);
 	}
+
+	if (sb->final_buf_size && cp[-1] != '\n')
+		putchar('\n');
 }
 
 static void output(struct scoreboard *sb, int option)