tests: pcimock: Remove check for fakesysfsdir

init_env() will return right away if fakesysfsdir is already
initialized, so this check is redundant.

tests/virpcimock.c

@@ -229,7 +229,6 @@ static int
 getrealpath(char **newpath,
             const char *path)
 {
-    if (!fakesysfsdir)
     init_env();
 
     if (STRPREFIX(path, PCI_SYSFS_PREFIX)) {