Fix copypasta in gcc_version

Signed-off-by: Bence Szépkúti <bence.szepkuti@arm.com>
diff --git a/tests/scripts/all.sh b/tests/scripts/all.sh
index df2024b..a162908 100755
--- a/tests/scripts/all.sh
+++ b/tests/scripts/all.sh
@@ -798,11 +798,11 @@
 }
 
 gcc_version() {
-    cc="$1"
-    if command -v clang > /dev/null ; then
-        "$cc" --version | sed -En '1s/^[^ ]* \([^)]*\) ([0-9]+).*/\1/p'
+    gcc="$1"
+    if command -v "$gcc" > /dev/null ; then
+        "$gcc" --version | sed -En '1s/^[^ ]* \([^)]*\) ([0-9]+).*/\1/p'
     else
-        echo 0  # report version 0 for "no clang"
+        echo 0  # report version 0 for "no gcc"
     fi
 }