Remove the unnessary empty line after label

Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

libs/libc/stdio/lib_libvscanf.c

@@ -123,7 +123,8 @@ static FAR const char *findscanset(FAR const char *fmt,
     {
       set[c / 8] |= (1 << (c % 8));     /* Take character c */
 
-    doswitch:n = fmt_char(fmt++);       /* Examine the next */
+doswitch:
+      n = fmt_char(fmt++);       /* Examine the next */
       switch (n)
         {
         case 0:                /* Format ended too soon */

libs/libc/stdio/lib_libvsprintf.c

@@ -580,7 +580,7 @@ static int vsprintf_internal(FAR struct lib_outstream_s *stream,
 
           flags &= ~FL_FLTUPP;
 
-          flt_oper:
+flt_oper:
           ndigs = 0;
           if ((flags & FL_PREC) == 0)
             {
@@ -937,7 +937,7 @@ static int vsprintf_internal(FAR struct lib_outstream_s *stream,
 
           size = strnlen(pnt, (flags & FL_PREC) ? prec : ~0);
 
-        str_lpad:
+str_lpad:
           if ((flags & FL_LPAD) == 0)
             {
               while (size < width)

libs/libc/stdio/lib_setvbuf.c

@@ -245,7 +245,6 @@ int setvbuf(FAR FILE *stream, FAR char *buffer, int mode, size_t size)
   /* Update the stream flags and return success */
 
 reuse_buffer:
-
   stream->fs_flags    = flags;
   lib_give_semaphore(stream);
   return OK;

libs/libc/time/lib_strptime.c

@@ -172,11 +172,11 @@ static FAR const unsigned char *_strptime(FAR const unsigned char *buf,
           goto literal;
         }
 
-    again:
+again:
       switch (c = *fmt++)
         {
           case '%': /* "%%" is converted to "%". */
-          literal:
+literal:
             if (c != *bp++)
               {
                 return NULL;