Fix string formatting in exception raise

[Daniel Mueller <mueller-daniel at posteo dot net>]

Hi,

The attached patch fixes a string formatting issue when raising a
SyntaxError in gdb/python/lib/gdb/command/xmethods.py.

Regards,
Daniel

diff --git gdb/python/lib/gdb/command/xmethods.py gdb/python/lib/gdb/command/xmethods.py
index 46f7b6..cadf5c 100644
--- gdb/python/lib/gdb/command/xmethods.py
+++ gdb/python/lib/gdb/command/xmethods.py
@@ -24,7 +24,7 @@ def validate_xm_regexp(part_name, regexp):
     try:
         return re.compile(regexp)
     except SyntaxError:
-        raise SyntaxError("Invalid %s regexp: %s", part_name, regexp)
+        raise SyntaxError("Invalid %s regexp: %s" % (part_name, regexp))
 
 
 def parse_xm_command_args(arg):

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