bisect--helper: return error codes from cmd_bisect__helper()

Since we want to get rid of git-bisect.sh, it would be necessary
to convert bisect.c exit() calls to return statements so
that errors can be reported. Let's prepare for that by making
it possible to return different error codes than just 0 or 1.

Different error codes might enable a bisecting script calling the
bisect command that uses this function to do different things
depending on the exit status of the bisect command.

Mentored-by: Christian Couder <[email protected]>
Mentored-by: Johannes Schindelin <[email protected]>
Signed-off-by: Tanushree Tumane <[email protected]>
Signed-off-by: Miriam Rubio <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: pranitbauva1997

builtin/bisect--helper.c

@@ -713,5 +713,5 @@ int cmd_bisect__helper(int argc, const char **argv, const char *prefix)
 		return error("BUG: unknown subcommand '%d'", cmdmode);
 	}
 	free_terms(&terms);
-	return !!res;
+	return abs(res);
 }