Update memory to return int (nf-core#8938)

Author: mahesh-panchal

modules/nf-core/bbmap/bbduk/main.nf

@@ -26,15 +26,15 @@ process BBMAP_BBDUK {
     def trimmed  = meta.single_end ? "out=${prefix}.fastq.gz" : "out1=${prefix}_1.fastq.gz out2=${prefix}_2.fastq.gz"
     def contaminants_fa = contaminants ? "ref=$contaminants" : ''
     """
-    maxmem=\$(echo \"$task.memory\"| sed 's/ GB/g/g')
     bbduk.sh \\
-        -Xmx\$maxmem \\
+        -Xmx${task.memory.toGiga()}g \\
         $raw \\
         $trimmed \\
         threads=$task.cpus \\
         $args \\
         $contaminants_fa \\
         &> ${prefix}.bbduk.log
+
     cat <<-END_VERSIONS > versions.yml
     "${task.process}":
         bbmap: \$(bbversion.sh | grep -v "]")