configure: improve CURL_CHECK_COMPILER_PROTOTYPE_MISMATCH

The compiler test used a variable before it was assigned when it tried
to see how it acts on a mismatching prototype, which could cause a false
positive.

diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 2467128..59135ef 100644 (file)
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -1479,7 +1479,7 @@ AC_DEFUN([CURL_CHECK_COMPILER_PROTOTYPE_MISMATCH], [
           return n;
       }
     ]],[[
-      int i[2];
+      int i[2]={0,0};
       int j = rand(i[0]);
       if(j)
         return j;