Nuked almost all trailing white space.

We better do this once and for all instead of cluttering all future
commits with diffs of trailing white spaces.  In the majority of cases
blank or single lines are affected and thus this change won't disturb
a git blame too much.  For future commits the pre-commit scripts
checks that this won't happen again.

common/membuf.c

@@ -85,7 +85,7 @@ put_membuf (membuf_t *mb, const void *buf, size_t len)
   if (mb->len + len >= mb->size)
     {
       char *p;
-      
+
       mb->size += len + 1024;
       p = xtryrealloc (mb->buf, mb->size);
       if (!p)
@@ -94,7 +94,7 @@ put_membuf (membuf_t *mb, const void *buf, size_t len)
           /* Wipe out what we already accumulated.  This is required
              in case we are storing sensitive data here.  The membuf
              API does not provide another way to cleanup after an
-             error. */ 
+             error. */
           wipememory (mb->buf, mb->len);
           return;
         }
@@ -158,4 +158,3 @@ peek_membuf (membuf_t *mb, size_t *len)
     *len = mb->len;
   return p;
 }
-