Fix a few minor issues (#473)

Changes:
- Fixed two xtrace test failures introduced in commit cfc8744c.
- The definition of _use_ntfork_tcpgrp in xec.c is now dependent on
  SHOPT_SPAWN being defined (re: 8e9ed5be).
- Removed many unnecessary newlines and fixed various typos.

src/cmd/ksh93/edit/edit.c

@@ -69,7 +69,6 @@ static Lex_t *savelex;
     {
 	switch(c)
 	{
-	    
 	    case cntl('A'): return('A');
 	    case cntl('B'): return('B');
 	    case cntl('C'): return('C');

src/cmd/ksh93/edit/emacs.c

@@ -205,7 +205,6 @@ int ed_emacsread(void *context, int fd,char *buff,int scend, int reedit)
 	}
 	raw = 1;
 	/* This mess in case the read system call fails */
-	
 	ed_setup(ep->ed,fd,reedit);
 #if !SHOPT_MULTIBYTE
 	out = (genchar*)buff;
@@ -715,9 +714,7 @@ update:
 			continue;
 		}
 	}
-	
 process:
-
 	if (c == (-1))
 	{
 		lookahead = 0;
@@ -1414,7 +1411,6 @@ static void search(Emacs_t* ep,genchar *out,int direction)
 	}
 	skip:
 	i = genlen(string);
-	
 	if(ep->prevdirection == -2 && i!=2 || direction!=1)
 		ep->prevdirection = -1;
 	if (direction < 1)
@@ -1583,7 +1579,6 @@ static void draw(register Emacs_t *ep,Draw_t option)
 	**********************/
 	
 	i = ncursor - nscreen;
-	
 	if ((ep->offset && i<=ep->offset)||(i >= (ep->offset+w_size)))
 	{
 		/* Center the cursor on the screen */
@@ -1600,12 +1595,9 @@ static void draw(register Emacs_t *ep,Draw_t option)
 	
 	nptr = &nscreen[ep->offset];
 	sptr = ep->screen;
-	
 	i = w_size;
-	
 	while (i-- > 0)
 	{
-		
 		if (*nptr == '\0')
 		{
 			*(nptr + 1) = '\0';
@@ -1638,7 +1630,6 @@ static void draw(register Emacs_t *ep,Draw_t option)
 	if(ep->ed->e_multiline && option == REFRESH)
 		ed_setcursor(ep->ed, ep->screen, ep->ed->e_peol, ep->ed->e_peol, -1);
 
-	
 	/******************
 	
 	Screen overflow checks 

src/cmd/ksh93/edit/history.c

@@ -178,7 +178,6 @@ static int sh_checkaudit(History_t *hp, const char *name, char *logbuf, size_t l
 done:
 	sh_close(fd);
 	return(r);
-	
 }
 #endif /* SHOPT_AUDIT */
 
@@ -1014,7 +1013,6 @@ int hist_copy(char *s1,int size,int command,int line)
 			}
 			*s1++ = c;
 		}
-			
 	}
 	sfseek(hp->histfp,(off_t)0,SEEK_END);
 	if(s1==0)