Use xmalloc() and friends to catch allocation failures

Some places use the standard malloc/strdup without checking if the
allocation was successful; they should use xmalloc/xstrdup that
check the memory allocation result.
Signed-off-by: NDotan Barak <dotanba@gmail.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

builtin-http-fetch.c

@@ -53,7 +53,7 @@ int cmd_http_fetch(int argc, const char **argv, const char *prefix)
 	}
 	url = argv[arg];
 	if (url && url[strlen(url)-1] != '/') {
-		rewritten_url = malloc(strlen(url)+2);
+		rewritten_url = xmalloc(strlen(url)+2);
 		strcpy(rewritten_url, url);
 		strcat(rewritten_url, "/");
 		url = rewritten_url;

git.c

@@ -364,7 +364,7 @@ static void handle_internal_command(int argc, const char **argv)
 	if (sizeof(ext) > 1) {
 		i = strlen(argv[0]) - strlen(ext);
 		if (i > 0 && !strcmp(argv[0] + i, ext)) {
-			char *argv0 = strdup(argv[0]);
+			char *argv0 = xstrdup(argv[0]);
 			argv[0] = cmd = argv0;
 			argv0[i] = '\0';
 		}

http-push.c

@@ -2237,7 +2237,7 @@ int main(int argc, char **argv)
 	no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
 
 	if (remote->url && remote->url[strlen(remote->url)-1] != '/') {
-		rewritten_url = malloc(strlen(remote->url)+2);
+		rewritten_url = xmalloc(strlen(remote->url)+2);
 		strcpy(rewritten_url, remote->url);
 		strcat(rewritten_url, "/");
 		remote->url = rewritten_url;

http.c

@@ -402,7 +402,7 @@ static struct fill_chain *fill_cfg = NULL;
 
 void add_fill_function(void *data, int (*fill)(void *))
 {
-	struct fill_chain *new = malloc(sizeof(*new));
+	struct fill_chain *new = xmalloc(sizeof(*new));
 	struct fill_chain **linkp = &fill_cfg;
 	new->data = data;
 	new->fill = fill;

remote.c

@@ -69,7 +69,7 @@ static const char *alias_url(const char *url)
 	if (!longest)
 		return url;
 
-	ret = malloc(rewrite[longest_i]->baselen +
+	ret = xmalloc(rewrite[longest_i]->baselen +
 		     (strlen(url) - longest->len) + 1);
 	strcpy(ret, rewrite[longest_i]->base);
 	strcpy(ret + rewrite[longest_i]->baselen, url + longest->len);
@@ -152,7 +152,7 @@ static struct branch *make_branch(const char *name, int len)
 		ret->name = xstrndup(name, len);
 	else
 		ret->name = xstrdup(name);
-	refname = malloc(strlen(name) + strlen("refs/heads/") + 1);
+	refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
 	strcpy(refname, "refs/heads/");
 	strcpy(refname + strlen("refs/heads/"), ret->name);
 	ret->refname = refname;