scripts/gdb: fix interrupts display after MCP on x86

commit 7627b459aa0737bdd62a8591a1481cda467f20e3 upstream.

The text line would not be appended to as it should have, it should have
been a '+=' but ended up being a '==', fix that.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: b0969d7 ("scripts/gdb: print interrupts")
Signed-off-by: Florian Fainelli <[email protected]>
Cc: Jan Kiszka <[email protected]>
Cc: Kieran Bingham <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
(cherry picked from commit cb89f9bf6c3a3b67a6a7baa8f7d9256697711e7f)

Author: ffainelli

scripts/gdb/linux/interrupts.py

@@ -142,7 +142,7 @@ def x86_show_interupts(prec):
 
     if constants.LX_CONFIG_X86_MCE:
         text += x86_show_mce(prec, "&mce_exception_count", "MCE", "Machine check exceptions")
-        text == x86_show_mce(prec, "&mce_poll_count", "MCP", "Machine check polls")
+        text += x86_show_mce(prec, "&mce_poll_count", "MCP", "Machine check polls")
 
     text += show_irq_err_count(prec)