utf8.c: No need to look at trailing NUL in comparing string

I meant to get this into commit
b0b342d4b3fa61880a96b645a3dab648f7c4c682, but didn't.  Subtract 1 from
the sizeof a constant string to get the number of bytes to compare, as
we don't need to look at the trailing NUL.

1 files changed, 1 insertions, 1 deletions

diff --git a/utf8.c b/utf8.c
index 8b301b26f8..d75757749a 100644
--- a/utf8.c
+++ b/utf8.c
@@ -452,7 +452,7 @@ S_does_utf8_overflow(const U8 * const s, const U8 * e)
     if (isFF_OVERLONG(s, e - s)) {
         const U8 max_32_bit_overlong[] = "\xFF\x80\x80\x80\x80\x80\x80\x84";
         return memGE(s, max_32_bit_overlong,
-                                    MIN(e - s, sizeof(max_32_bit_overlong)));
+                                MIN(e - s, sizeof(max_32_bit_overlong) - 1));
     }
 
 #endif