char: rename qemu_chr_guest_open() -> qemu_chr_fe_open()

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/qemu-char.c b/qemu-char.c
index d3bfcaf..eb0cc74 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2632,7 +2632,7 @@
     }
 }
 
-void qemu_chr_guest_open(struct CharDriverState *chr)
+void qemu_chr_fe_open(struct CharDriverState *chr)
 {
     if (chr->chr_guest_open) {
         chr->chr_guest_open(chr);