[Mips] Remove an unnecessary wrapping of a predicate with std::ptr_fun. NFC

llvm-svn: 253855

llvm/lib/Target/Mips/MipsISelLowering.cpp

@@ -3334,7 +3334,7 @@ static std::pair<bool, bool> parsePhysicalReg(StringRef C, StringRef &Prefix,
 
   // Search for the first numeric character.
   StringRef::const_iterator I, B = C.begin() + 1, E = C.end() - 1;
-  I = std::find_if(B, E, std::ptr_fun(isdigit));
+  I = std::find_if(B, E, isdigit);
 
   Prefix = StringRef(B, I - B);