fs/binfmt_misc.c: simplify entry_status()

fs/binfmt_misc.c: simplify entry_status()

sprintf() reliably returns the number of characters printed, so we don't
need to ask strlen() where we are.  Also replace calling sprintf("%02x")
in a loop with the much simpler bin2hex().

[[email protected]: it's odd to include kernel.h after everything else]
Signed-off-by: Rasmus Villemoes <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>