[gparted] Fix ignoring return value compiler warnings

[Curtis Gedak <gedakc src gnome org>]

commit f768cbd1b4e186acab1ba9c434de0cac8392a69b
Author: Curtis Gedak <gedakc gmail com>
Date:   Sat Jul 16 10:09:04 2011 -0600

    Fix ignoring return value compiler warnings
    
    Add code to handle situation where realpath might return a NULL value.
    Prior to this change the compiler would complain with the following
    message:
    
    error: ignoring return value of âchar* realpath(const char*, char*)â,
    declared with attribute warn_unused_result

 src/DMRaid.cc |   28 ++++++++++++++++------------
 1 files changed, 16 insertions(+), 12 deletions(-)
---
diff --git a/src/DMRaid.cc b/src/DMRaid.cc
index da82530..9b51af8 100644
--- a/src/DMRaid.cc
+++ b/src/DMRaid.cc
@@ -128,12 +128,14 @@ bool DMRaid::is_dmraid_device( const Glib::ustring & dev_path )
 			//Path is a symbolic link so find real path
 			char c_str[4096+1] ;
 			//FIXME: it seems realpath is very unsafe to use (manpage)...
-			realpath( dev_path .c_str(), c_str ) ;
-			Glib::ustring tmp_path = c_str ;
-			if ( tmp_path .length() > 0 )
-				for ( unsigned int k=0; k < dmraid_devices .size(); k++ )
-					if ( tmp_path .find( dmraid_devices[k] ) != Glib::ustring::npos )
-						device_found = true ;
+			if ( realpath( dev_path .c_str(), c_str ) != NULL )
+			{
+				Glib::ustring tmp_path = c_str ;
+				if ( tmp_path .length() > 0 )
+					for ( unsigned int k=0; k < dmraid_devices .size(); k++ )
+						if ( tmp_path .find( dmraid_devices[k] ) != Glib::ustring::npos )
+							device_found = true ;
+			}
 		}
 	}
 
@@ -196,12 +198,14 @@ Glib::ustring DMRaid::get_dmraid_name( const Glib::ustring & dev_path )
 			//Path is a symbolic link so find real path
 			char c_str[4096+1] ;
 			//FIXME: it seems realpath is very unsafe to use (manpage)...
-			realpath( dev_path .c_str(), c_str ) ;
-			Glib::ustring tmp_path = c_str ;
-			if ( tmp_path .length() > 0 )
-				for ( unsigned int k=0; k < dmraid_devices .size(); k++ )
-					if ( tmp_path .find( dmraid_devices[k] ) != Glib::ustring::npos )
-						dmraid_name = dmraid_devices[k] ;
+			if( realpath( dev_path .c_str(), c_str ) != NULL )
+			{
+				Glib::ustring tmp_path = c_str ;
+				if ( tmp_path .length() > 0 )
+					for ( unsigned int k=0; k < dmraid_devices .size(); k++ )
+						if ( tmp_path .find( dmraid_devices[k] ) != Glib::ustring::npos )
+							dmraid_name = dmraid_devices[k] ;
+			}
 		}
 	}