scripts: objdiff: remove unnecessary code

The directories for objdump is created by the code
a few lines below:

  [ ! -d "$OBJDIFFD/$dn" ] && mkdir -p "$OBJDIFFD/$dn"
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Michal Marek <mmarek@suse.cz>

scripts/objdiff

@@ -52,8 +52,6 @@ dorecord() {
 	OBJDUMP="${CROSS_COMPILE}objdump"
 	OBJDIFFD="$TMPD/$CMT"
 
-	[ ! -d "$OBJDIFFD" ] && mkdir -p "$OBJDIFFD"
-
 	for f in $FILES; do
 		dn="${f%/*}"
 		bn="${f##*/}"