common/rc: fix up variable naming

Remove the leading underscore from local variable names, and add a
leading underscore to $err_msg to reflect its status as a global
variable shared by 'check' and 'common/report'.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

check

@@ -38,7 +38,7 @@ randomize=false
 export here=`pwd`
 xfile=""
 brief_test_summary=false
-err_msg=""
+_err_msg=""
 do_report=false
 DUMP_OUTPUT=false
 
@@ -634,7 +634,7 @@ for section in $HOST_OPTIONS_SECTIONS; do
 	for seq in $list
 	do
 	    err=false
-	    err_msg=""
+	    _err_msg=""
 	    if [ ! -f $seq ]; then
 	        # Try to get full name in case the user supplied only seq id
 	        # and the test has a name. A bit of hassle to find really
@@ -732,8 +732,8 @@ for section in $HOST_OPTIONS_SECTIONS; do
 
 		if [ -f core ]
 		then
-		    err_msg="[dumped core]"
-		    echo -n " $err_msg"
+		    _err_msg="[dumped core]"
+		    echo -n " $_err_msg"
 		    mv core $RESULT_BASE/$seqnum.core
 		    err=true
 		fi
@@ -749,8 +749,8 @@ for section in $HOST_OPTIONS_SECTIONS; do
 		else
 		    if [ $sts -ne 0 ]
 		    then
-			err_msg="[failed, exit status $sts]"
-			echo -n " $err_msg"
+			_err_msg="[failed, exit status $sts]"
+			echo -n " $_err_msg"
 			err=true
 		    fi
 		    if [ ! -f $seq.out ]
@@ -785,7 +785,7 @@ for section in $HOST_OPTIONS_SECTIONS; do
 						" to see the entire diff)"
 				fi; } | \
 				sed -e 's/^\(.\)/    \1/'
-			    err_msg="output mismatch (see $diff $seq.out $seqres.out.bad)"
+			    _err_msg="output mismatch (see $diff $seq.out $seqres.out.bad)"
 			    err=true
 			fi
 		    fi