Description: Fix gf_vsnprintf parameter declaration
Author: Stephen Kitt <skitt@debian.org>

--- a/src/libgfortran/runtime/error.c
+++ b/src/libgfortran/runtime/error.c
@@ -138,7 +138,7 @@
 
 #ifndef HAVE_VSNPRINTF
 static int
-gf_vsnprintf (char *str, size_t size, const char *format, va_list ap)
+gf_vsnprintf (char *buffer, size_t size, const char *format, va_list ap)
 {
   int written;