Close a memory leak in configuration code

This was causing configuration failures on address sanitizer builds.

Close a memory leak in configuration code
a5741100 · Alastair Murray · cd525ae8 · a5741100
Commit a5741100 authored Feb 09, 2016 by Alastair Murray
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posix_regex.cpp cmake/posix_regex.cpp +3 -1

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--- a/cmake/posix_regex.cpp
+++ b/cmake/posix_regex.cpp
@@ -7,6 +7,8 @@ int main() {
  if (ec != 0) {
    return ec;
  }
-  return regexec(&re, str.c_str(), 0, nullptr, 0) ? -1 : 0;
+  int ret = regexec(&re, str.c_str(), 0, nullptr, 0) ? -1 : 0;
+  regfree(&re);
+  return ret;
 }