lib/string_helpers: clarify esc arg in string_escape_mem
lib/string_helpers: clarify esc arg in string_escape_mem

The esc argument is used to reduce which characters will be escaped.  For
example, using " " with ESCAPE_SPACE will not produce any escaped spaces.

Signed-off-by: Kees Cook <50cb10d2be062154b17ab4d66a4eab34f1cf1c84@chromium.org>
Cc: Andy Shevchenko <74f0c009df510614346aa771cd21959b78cdb413@linux.intel.com>
Cc: Rasmus Villemoes <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@rasmusvillemoes.dk>
Cc: Mathias Krause <64568d9183dcfcdd0a6fb47964820a1cdaf94ecc@googlemail.com>
Cc: James Bottomley <407b36959ca09543ccda8f8e06721c791bc53435@HansenPartnership.com>
Signed-off-by: Andrew Morton <5c1e68b099950c134891f0b6e179498a8ebe9cf9@linux-foundation.org>
Signed-off-by: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs