linux_sysfs.c: Include <limits.h> for PATH_MAX

Fixes compilation with musl libc.

Tested-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Felix Janda <felix.janda@posteo.de>
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
diff --git a/src/linux_sysfs.c b/src/linux_sysfs.c
index 50d94cf..3f95e53 100644
--- a/src/linux_sysfs.c
+++ b/src/linux_sysfs.c
@@ -45,6 +45,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <limits.h>
 #include <sys/mman.h>
 #include <dirent.h>
 #include <errno.h>