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.

sm/certreqgen-ui.c

@@ -22,7 +22,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
-#include <unistd.h> 
+#include <unistd.h>
 #include <time.h>
 #include <assert.h>
 
@@ -40,7 +40,7 @@ ask_mb_lines (membuf_t *mb, const char *prefix)
 {
   char *answer = NULL;
 
-  do 
+  do
     {
       xfree (answer);
       answer = tty_get ("> ");
@@ -88,7 +88,7 @@ store_mb_lines (membuf_t *mb, membuf_t *lines)
 
 /* Chech whether we have a key for the key with HEXGRIP.  Returns NULL
    if not or a string describing the type of the key (RSA, ELG, DSA,
-   etc..).  */ 
+   etc..).  */
 static const char *
 check_keygrip (ctrl_t ctrl, const char *hexgrip)
 {
@@ -202,7 +202,7 @@ gpgsm_gencertreq_tty (ctrl_t ctrl, estream_t output_stream)
           answer = tty_get (_("Enter the keygrip: "));
           tty_kill_prompt ();
           trim_spaces (answer);
-          
+
           if (!*answer)
             goto again;
           else if (strlen (answer) != 40 &&