wireless: hostap: proc: print properly escaped SSID

wireless: hostap: proc: print properly escaped SSID

Instead of substituting non-printable characters by '_' let's print SSID
properly escaped by using recently added %*pE specifier.

[[email protected]: fix printk type warning]
[[email protected]: remove now-unused local `i']
Signed-off-by: Andy Shevchenko <[email protected]>
Cc: "John W . Linville" <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Joe Perches <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>