git.c: remove excess output for debugging when command is too long.

When the given command name was too long, we exited with a
message with the number of bytes of the final command name
inside parentheses, without saying what that number is.  It was
only meant as a debugging aid while development, so remove it.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git.c

@@ -289,7 +289,7 @@ int main(int argc, char **argv, char **envp)
 	len += snprintf(git_command + len, sizeof(git_command) - len,
 			"/git-%s", argv[i]);
 	if (sizeof(git_command) <= len) {
-		fprintf(stderr, "git: command name given is too long (%d)\n", len);
+		fprintf(stderr, "git: command name given is too long.\n");
 		exit(1);
 	}