Do not use %m in common code to print error messages

The %m format specifier is an extension from glibc - and when compiling
QEMU for NetBSD, the compiler correctly complains, e.g.:

/home/qemu/qemu-test.ELjfrQ/src/util/main-loop.c: In function 'sigfd_handler':
/home/qemu/qemu-test.ELjfrQ/src/util/main-loop.c:64:13: warning: %m is only
 allowed in syslog(3) like functions [-Wformat=]
             printf("read from sigfd returned %zd: %m\n", len);
             ^
Let's use g_strerror() here instead, which is an easy-to-use wrapper
around the thread-safe strerror_r() function.

While we're at it, also convert the "printf()" in main-loop.c into
the preferred "error_report()".

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20191018130716.25438-1-thuth@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/hw/misc/tmp421.c b/hw/misc/tmp421.c
index 9f044705fa..c0bc150bca 100644
--- a/hw/misc/tmp421.c
+++ b/hw/misc/tmp421.c
@@ -120,7 +120,7 @@ static void tmp421_get_temperature(Object *obj, Visitor *v, const char *name,
     int tempid;
 
     if (sscanf(name, "temperature%d", &tempid) != 1) {
-        error_setg(errp, "error reading %s: %m", name);
+        error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
         return;
     }
 
@@ -160,7 +160,7 @@ static void tmp421_set_temperature(Object *obj, Visitor *v, const char *name,
     }
 
     if (sscanf(name, "temperature%d", &tempid) != 1) {
-        error_setg(errp, "error reading %s: %m", name);
+        error_setg(errp, "error reading %s: %s", name, g_strerror(errno));
         return;
     }