git-compat-util.h: fix typo

The words "save" and "safe" are both very wonderful words, each with
their own set of meanings. Let's not confuse them with one another save
on occasion of a pun.
Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

git-compat-util.h

@@ -217,7 +217,7 @@
 #endif
 #ifdef NO_INTPTR_T
 /*
- * On I16LP32, ILP32 and LP64 "long" is the save bet, however
+ * On I16LP32, ILP32 and LP64 "long" is the safe bet, however
  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
  * while on IP16 and IP16L32 it is "int" (resp. "short")
  * Size needs to match (or exceed) 'sizeof(void *)'.