Dpkg::Changelog::Parse: Say execute instead of exec in error message

debian/changelog

@@ -81,6 +81,8 @@ dpkg (1.18.0) UNRELEASED; urgency=low
   * Only use stackprotectorstrong when building dpkg with gcc >= 4.9.
   * Do not fail on dpkg-query -W and -l when multiple arguments match the
     same package. Closes: #588505
+  * Output strings fixes and improvements:
+    - Say “execute” instead of “exec” in Dpkg::Changelog::Parse error message.
 
   [ Raphaël Hertzog ]
   * Drop myself from Uploaders.

scripts/Dpkg/Changelog/Parse.pm

@@ -143,7 +143,7 @@ sub changelog_parse {
     my $pid = open(my $parser_fh, '-|');
     syserr(g_('cannot fork for %s'), $parser) unless defined $pid;
     if (not $pid) {
-	exec(@exec) or syserr(g_('cannot exec format parser: %s'), $parser);
+        exec @exec or syserr(g_('cannot execute format parser: %s'), $parser);
     }
 
     # Get the output into several Dpkg::Control objects