expr: Use end pointer to detect string-to-number conversion failures

We explicitly ignore ERANGE for strtod, and in any other error case,
the end pointer is set to the beginning of the string.

1 files changed, 0 insertions, 1 deletions

diff --git a/qbe.c b/qbe.c
index a1f2773..50eb5eb 100644
--- a/qbe.c
+++ b/qbe.c
@@ -1,6 +1,5 @@
 #include <assert.h>
 #include <ctype.h>
-#include <errno.h>
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>