sv.h Convert _svvalid to legal name

Author: khwilliamson

sv.h

@@ -1334,12 +1334,12 @@ object type. Exposed to perl code via Internals::SvREADONLY().
 
 /* Does the SV have a Boyer-Moore table attached as magic?
  * 'VALID' is a poor name, but is kept for historical reasons.  */
-#define SvVALID(_svvalid) (                                  \
-               SvPOKp(_svvalid)                              \
-            && SvSMAGICAL(_svvalid)                          \
-            && SvMAGIC(_svvalid)                             \
-            && (SvMAGIC(_svvalid)->mg_type == PERL_MAGIC_bm  \
-                || mg_find(_svvalid, PERL_MAGIC_bm))         \
+#define SvVALID(svvalid_) (                                  \
+               SvPOKp(svvalid_)                              \
+            && SvSMAGICAL(svvalid_)                          \
+            && SvMAGIC(svvalid_)                             \
+            && (SvMAGIC(svvalid_)->mg_type == PERL_MAGIC_bm  \
+                || mg_find(svvalid_, PERL_MAGIC_bm))         \
         )
 
 #define SvRVx(sv) SvRV(sv)