Shouldn't mangle_path always mangle '\\'?

[Daniel Colascione (SEATTLE)]

mangle_path accepts a string listing the characters it's supposed to
escape. Some, but not all, callers put backslash in this set. Shouldn't
we be escaping '\' regardless, since it's the character used to signal
all other escapes?

diff --git a/fs/seq_file.c b/fs/seq_file.c
index 555f821..02dcd5c 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -443,7 +443,7 @@ char *mangle_path(char *s, const char *p, const char
*esc)
 		char c = *p++;
 		if (!c) {
 			return s;
-		} else if (!strchr(esc, c)) {
+		} else if (s != '\\' && !strchr(esc, c)) {
 			*s++ = c;
 		} else if (s + 4 > p) {
 			break;

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