error: Add an accessor for progname

We'd like to get the progname for help output, so add an accessor.
Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Reviewed-by: NAndreas F=E4rber <afaerber@suse.de>
Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

qemu-error.c

@@ -157,6 +157,11 @@ void error_set_progname(const char *argv0)
     progname = p ? p + 1 : argv0;
 }
 
+const char *error_get_progname(void)
+{
+    return progname;
+}
+
 /*
  * Print current location to current monitor if we have one, else to stderr.
  */

qemu-error.h

@@ -36,5 +36,6 @@ void error_printf_unless_qmp(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
 void error_print_loc(void);
 void error_set_progname(const char *argv0);
 void error_report(const char *fmt, ...) GCC_FMT_ATTR(1, 2);
+const char *error_get_progname(void);
 
 #endif