Fix warnings that would be generated by gcc -Wstrict-prototypes

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5021 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/mips-dis.c b/mips-dis.c
index 7cf0793..867ecf2 100644
--- a/mips-dis.c
+++ b/mips-dis.c
@@ -3322,9 +3322,7 @@
 }
 
 void
-parse_mips_dis_option (option, len)
-     const char *option;
-     unsigned int len;
+parse_mips_dis_option (const char *option, unsigned int len)
 {
   unsigned int i, optionlen, vallen;
   const char *val;