use xmalloc in git.c and help.c

diff --git a/builtin-checkout-index.c b/builtin-checkout-index.c
index b097c888a0da044d6dc78c9747eb18e45b46709d..afe4b0e4520f47f1dace1383bfc2b364b1b1def0 100644 (file)
--- a/builtin-checkout-index.c
+++ b/builtin-checkout-index.c
@@ -223,12 +223,12 @@ int cmd_checkout_index(int argc, const char **argv, const char *prefix)
                        to_tempfile = 1;
                        continue;
                }
-               if (!strncmp(arg, "--prefix=", 9)) {
+               if (!prefixcmp(arg, "--prefix=")) {
                        state.base_dir = arg+9;
                        state.base_dir_len = strlen(state.base_dir);
                        continue;
                }
-               if (!strncmp(arg, "--stage=", 8)) {
+               if (!prefixcmp(arg, "--stage=")) {
                        if (!strcmp(arg + 8, "all")) {
                                to_tempfile = 1;
                                checkout_stage = CHECKOUT_ALL;