Fixed bugs in std.cfg

cfg/std.cfg

@@ -150,7 +150,6 @@
     <leak-ignore/>
     <arg nr="1">
       <not-uninit/>
-      <valid>1</valid>
     </arg>
   </function>
   <!-- double sqrt(double x); -->
@@ -4702,7 +4701,7 @@
       <valid>0:</valid>
     </arg>
   </function>
-  <!-- size_t strstr(const char *s1, const char *s2); -->
+  <!-- char* strstr(const char *s1, const char *s2); -->
   <function name="strstr,std::strstr">
     <use-retval/>
     <noreturn>false</noreturn>