Fix error seen in sensors-detect if i2c bus numbering is not sequential

git-svn-id: http://lm-sensors.org/svn/lm-sensors/trunk@5870 7894878c-1315-0410-8ee3-d5d059ff63e0

CHANGES

@@ -2,6 +2,7 @@ lm-sensors CHANGES file
 -----------------------
 
 SVN HEAD
+  sensors-detect: Fix error seen if I2C bus numbers are not sequential
   Makefile: Check for bison and flex
   sensors-detect: Improve LM90 and W83L771 detection
 

prog/detect/sensors-detect

@@ -5937,6 +5937,7 @@ sub generate_modprobes
 	# the adapter drivers so that the numbers will be the same. If not, then
 	# we only load the adapter drivers which are useful.
 	foreach $adap (@i2c_adapters) {
+		next unless defined $adap;
 		next if $adap->{autoload};
 		next if $adap->{driver} eq 'UNKNOWN';
 		next if not defined $configfile and not $adap->{used};