Mesa (master): util/os_file: actually return the error read() gave us

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Module: Mesa
Branch: master
Commit: 7e35f20d44321b20777020ad067d39116d142013
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7e35f20d44321b20777020ad067d39116d142013

Author: Eric Engestrom <eric.engestrom at intel.com>
Date:   Thu May 16 14:57:07 2019 +0100

util/os_file: actually return the error read() gave us

Fixes: 316964709e21286c2af5 "util: add os_read_file() helper"
Signed-off-by: Eric Engestrom <eric.engestrom at intel.com>
Reviewed-by: Eric Anholt <eric at anholt.net>

---

 src/util/os_file.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/util/os_file.c b/src/util/os_file.c
index 246fd32fdf6..da17d12b50e 100644
--- a/src/util/os_file.c
+++ b/src/util/os_file.c
@@ -29,8 +29,10 @@ readN(int fd, char *buf, size_t len)
       if (ret == -EINTR || ret == -EAGAIN)
          continue;
 
-      if (ret <= 0)
+      if (ret <= 0) {
+         err = ret;
          break;
+      }
 
       total += ret;
    } while (total != len);