Correct fscanf formatting string for I64u values

This fix is probably purely cosmetic because PRIuMAX is likely identical
to SCNuMAX. Nevertheless, when using a function of the scanf() family,
the correct interpolation to use is the latter, not the former.

Signed-off-by: Waldek Maleska <w.maleska@gmail.com>
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/gc.c

@@ -222,7 +222,7 @@ static const char *lock_repo_for_gc(int force, pid_t* ret_pid)
 			 * running.
 			 */
 			time(NULL) - st.st_mtime <= 12 * 3600 &&
-			fscanf(fp, "%"PRIuMAX" %127c", &pid, locking_host) == 2 &&
+			fscanf(fp, "%"SCNuMAX" %127c", &pid, locking_host) == 2 &&
 			/* be gentle to concurrent "gc" on remote hosts */
 			(strcmp(locking_host, my_host) || !kill(pid, 0) || errno == EPERM);
 		if (fp != NULL)

git-compat-util.h

@@ -237,6 +237,10 @@ extern char *gitbasename(char *);
 #define PRIuMAX "llu"
 #endif
 
+#ifndef SCNuMAX
+#define SCNuMAX PRIuMAX
+#endif
+
 #ifndef PRIu32
 #define PRIu32 "u"
 #endif