checkpath: fix memory leak

```
=================================================================
==22862==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 4096 byte(s) in 1 object(s) allocated from:
    #0 0x7f1fd5b12cb7 in __interceptor_malloc /usr/src/debug/sys-devel/gcc-11.2.1_p20220312/gcc-11-20220312/libsanitizer/asan/asan_malloc_linux.cpp:145
    #1 0x55556abecea7 in xmalloc ../src/includes/helpers.h:64
    #2 0x55556abecea7 in xasprintf ../src/includes/helpers.h:149
    #3 0x55556abeb6fb in do_check ../src/rc/checkpath.c:206
    #4 0x55556abeb6fb in main ../src/rc/checkpath.c:443
    #5 0x7f1fd58576cf in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

SUMMARY: AddressSanitizer: 4096 byte(s) leaked in 1 allocation(s).
```

Signed-off-by: Sam James <sam@gentoo.org>

Author: thesamesam

src/checkpath/checkpath.c

@@ -215,6 +215,7 @@ static int do_check(char *path, uid_t uid, gid_t gid, mode_t mode,
 			fd = openat(dirfd, name, flags, mode);
 			umask(u);
 			if (fd == -1) {
+				free(name);
 				eerror("%s: open: %s", applet, strerror(errno));
 				return -1;
 			}
@@ -230,12 +231,14 @@ static int do_check(char *path, uid_t uid, gid_t gid, mode_t mode,
 			r = mkdirat(dirfd, name, mode);
 			umask(u);
 			if (r == -1 && errno != EEXIST) {
+				free(name);
 				eerror("%s: mkdirat: %s", applet,
 				    strerror (errno));
 				return -1;
 			}
 			readfd = openat(dirfd, name, readflags);
 			if (readfd == -1) {
+				free(name);
 				eerror("%s: unable to open directory: %s", applet,
 						strerror(errno));
 				return -1;
@@ -248,18 +251,23 @@ static int do_check(char *path, uid_t uid, gid_t gid, mode_t mode,
 			r = mkfifo(path, mode);
 			umask(u);
 			if (r == -1 && errno != EEXIST) {
+				free(name);
 				eerror("%s: mkfifo: %s", applet,
 				    strerror (errno));
 				return -1;
 			}
 			readfd = openat(dirfd, name, readflags);
 			if (readfd == -1) {
+				free(name);
 				eerror("%s: unable to open fifo: %s", applet,
 						strerror(errno));
 				return -1;
 			}
 		}
 	}
+
+	free(name);
+
 	if (fstat(readfd, &st) != -1) {
 		if (type != inode_dir && S_ISDIR(st.st_mode)) {
 			eerror("%s: is a directory", path);