Improve grep command to detect fuzzer functions more precisely.

Author: sudiptob2

infra/base-images/base-builder/compile_native_go_fuzzer

@@ -15,6 +15,8 @@
 #
 ################################################################################
 
+set -x
+
 function build_native_go_fuzzer() {
 	fuzzer=$1
 	function=$2
@@ -52,7 +54,7 @@ abs_file_dir=$(go list $tags -f {{.Dir}} $path)
 fuzzer_filename=$(grep -r -l --include='*.go' -s "$function" "${abs_file_dir}")
 
 # Test if file contains a line with "func $function" and "testing.F".
-if [ $(grep -r "func $function" $fuzzer_filename | grep "testing.F" | wc -l) -eq 1 ]
+if [ $(grep -r "func $function(" $fuzzer_filename | grep "testing.F" | wc -l) -eq 1 ]
 then
 	build_native_go_fuzzer $fuzzer $function $abs_file_dir
 else