[librsvg] Add some extra parentheses to fix GCC warnings

[Christian Persch <chpe src gnome org>]

commit 2b73445c2bd2a9d3121d71a36f7248e8986117a7
Author: Felix Riemann <friemann gnome org>
Date:   Fri Mar 23 22:13:53 2012 +0100

    Add some extra parentheses to fix GCC warnings
    
    These can occur when using the -Wparentheses parameter.
    
    Bug #672725.

 rsvg-css.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/rsvg-css.c b/rsvg-css.c
index 1fda064..802739a 100644
--- a/rsvg-css.c
+++ b/rsvg-css.c
@@ -399,7 +399,7 @@ rsvg_css_parse_opacity (const char *str)
 
     opacity = g_ascii_strtod (str, &end_ptr);
 
-    if ((opacity == -HUGE_VAL || opacity == HUGE_VAL) && (ERANGE == errno) ||
+    if (((opacity == -HUGE_VAL || opacity == HUGE_VAL) && (ERANGE == errno)) ||
         *end_ptr != '\0')
         opacity = 1.;