Fix comment in mx_proc

mx_proc.c

@@ -460,7 +460,7 @@ pid_t mx_proc_get_parent(pid_t pid) {
     FILE *statfile;
     pid_t parent;
     int n;
-    char linebuf[256];  // "2147483647 (max128chars) X 2147483647 " = 156
+    char linebuf[64];  // "2147483647 (max15chars) X 2147483647 " = 43
 
     if (pid == 0)       // no need to try /proc/0/stat
         return -1;