Fix a forgotten skip of space at line begin for the 'system' command.

BitKeeper/etc/logging_ok

@@ -39,6 +39,7 @@ hf@deer.mysql.r18.ru
 hf@genie.(none)
 igor@hundin.mysql.fi
 igor@rurik.mysql.com
+ingo@mysql.com
 jani@dsl-jkl1657.dial.inet.fi
 jani@hynda.(none)
 jani@hynda.mysql.fi

client/mysql.cc

@@ -2042,6 +2042,10 @@ static int
 com_shell(String *buffer, char *line __attribute__((unused)))
 {
   char *shell_cmd;
+
+  /* Skip space from line begin */
+  while (isspace(*line))
+    line++;
   if (!(shell_cmd = strchr(line, ' ')))
   {
     put_info("Usage: \\! shell-command", INFO_ERROR);