(_errprint): Use single-quotes for a printf format string.

diff --git a/minc b/minc
index 26b7e6c..a534abc 100755 (executable)
--- a/minc
+++ b/minc
@@ -212,7 +212,7 @@ sub log_headers {
 # Utility procedures
 
 sub _errprint {
-    printf("%s:%s", __FILE__, __LINE__);
+    printf('%s:%s', __FILE__, __LINE__);
 
     if (@_) {
         print(': ');